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EP3875881B1 - Oberes waffengehäuse für modulare schrotflinte - Google Patents

Oberes waffengehäuse für modulare schrotflinte Download PDF

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Publication number
EP3875881B1
EP3875881B1 EP21160552.2A EP21160552A EP3875881B1 EP 3875881 B1 EP3875881 B1 EP 3875881B1 EP 21160552 A EP21160552 A EP 21160552A EP 3875881 B1 EP3875881 B1 EP 3875881B1
Authority
EP
European Patent Office
Prior art keywords
piston
gas
bonnet
barrel
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21160552.2A
Other languages
English (en)
French (fr)
Other versions
EP3875881A1 (de
EP3875881C0 (de
Inventor
Anthony Dichario
Raymond J. CATON
Roger Ellison CRIBB
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Tactical Inc
Original Assignee
American Tactical Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US16/807,624 external-priority patent/US11125516B2/en
Application filed by American Tactical Inc filed Critical American Tactical Inc
Publication of EP3875881A1 publication Critical patent/EP3875881A1/de
Application granted granted Critical
Publication of EP3875881B1 publication Critical patent/EP3875881B1/de
Publication of EP3875881C0 publication Critical patent/EP3875881C0/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/12—Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
    • F41A3/14—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively
    • F41A3/16—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks
    • F41A3/26—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks semi-automatically or automatically operated, e.g. having a slidable bolt-carrier and a rotatable bolt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F41A5/20—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated using a gas piston arranged concentrically around the barrel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F41A5/26—Arrangements or systems for bleeding the gas from the barrel
    • F41A5/28—Adjustable systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A11/00—Assembly or disassembly features; Modular concepts; Articulated or collapsible guns
    • F41A11/02—Modular concepts, e.g. weapon-family concepts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/66—Breech housings or frames; Receivers

Definitions

  • the present invention relates to a modular assault-type shotgun, and more particularly, to an upper receiver for a modular assault-type shotgun configured to be used with a lower receiver of an automatic or semi-automatic assault-type rifle.
  • the present invention relates to a modified military specification (mil-spec) upper receiver configured for use with a mil-spec lower receiver of an M-16/AR-15 firearm to create a modular assault-type shotgun.
  • the present invention relates to an adjustable gas piston assembly for use within a modular assault-type shotgun.
  • gas piston assemblies for firearms of the M-16/AR-15 type are principally known from documents such as EP 3 514 473 A1
  • documents US 2020/0025478 A1 , US 2013/0025445 A1 and US 2016/0003566 A1 disclose examples of gas piston assemblies that are adjustable.
  • AR-15 ® firearm is the most popular semi-automatic assault-type firearm used by civilians, particularly within the United States.
  • the AR-15 ® is the semi-automatic variant of the fully automatic M16 firearm used by United States military personnel.
  • AR-15 ® is a registered trademark of Colt Industries, a number of additional manufacturers manufacture clones of the AR-15 ® and market these clones under separate trademarks. While used throughout the specification, it is to be understood that the term AR-15 ® is meant to include not only those firearms manufactured by Colt Industries, but also those additional clones and any variants thereof.
  • the AR-15 ® firearm and M16 are designed as modular rifles generally comprising a buttstock, lower receiver, upper receiver and barrel assembly configured to fire .223 Remington or 5.56 ⁇ 45mm NATO military ammunition. Each component is separable from one another and affords firearm owners the opportunity to customize the firearm with after-market components such as barrels of differing lengths, upper receivers designed to handle different calibers of rifle ammunition, flashlights, hand guards, grenade or flare launchers, flash or sound suppressors, grips, and front or rear sights.
  • the lower receiver is configured to include a trigger wherein activation of the trigger causes a rifle cartridge housed within the chamber of the upper receiver to be fired out the barrel of the firearm by action of a reciprocating bolt carrier group.
  • the buttstock mounts to the lower receiver and includes a buffer assembly and action (or recoil) spring in communication with the bolt carrier group where the spring pushes the bolt carrier group back toward the chamber in preparation of firing another rifle cartridge.
  • AR-15 ® firearms have been configured to fire rifle cartridges only. Attempts to modify these firearms, and particularly the AR-15, to fire shotgun shells have run into a number of problems. For instance, AR-15 ® firearms have been modified to accommodate .410 bore shells but these modifications require lower receivers which no longer satisfy military specifications (mil-spec). Other modifications continue to result in jamming or binding of the shotgun shell cartridges when a cartridge has been fired, its shell is being ejected, or a new cartridge is being extracted from the magazine and loaded within the chamber.
  • Applicant has produced a shotgun shell magazine configured to feed shells from the magazine into a mil-spec AR-15 ® firearm/M16 lower receiver (see commonly owned U.S. Patent No. 9,664,469 (the ⁇ 469 Patent) issued May 30, 2017 .) Nevertheless, the direct impingement mechanism used within many assault-type rifles (including the M16/AR-15 ® firearm) may hinder or prevent proper ejection of the fired shotgun shell, or may fail to properly cycle the bolt carrier assembly during ejection and extraction.
  • an upper receiver and barrel assembly has been configured to mount to a lower receiver, wherein fired shotgun shells may be efficiently ejected after firing while also properly extracting the next successive shotgun shell from the magazine upon proper cycling of the bolt carrier assembly.
  • the modified M16/AR-15 ® firearm upper receiver is configured to mount to a mil-spec M16/AR-15 ® firearm lower receiver and automatically or semi-automatically fire .410 bore shotgun shells.
  • an adjustable gas piston assembly which includes a selectively adjustable gas regulator which can be quickly and easily adjusted so as to maintain proper cycling of the action when using a variety of commercially available .410 bore shotgun shells.
  • the present invention addresses these and other needs.
  • an embodiment the present invention is directed to an upper receiver and barrel assembly configured to mount to a lower receiver and receive and fire a shotgun shell.
  • the upper receiver and barrel assembly comprises an upper receiver, a barrel assembly and a gas piston assembly.
  • the upper receiver comprises an upper receiver housing defining a chamber configured to receive the shotgun shell therein and a bolt carrier group.
  • the bolt carrier group includes a bolt carrier slidably received within the upper receiver housing, wherein the bolt carrier travels from a forward position to a rearward position upon firing of the shotgun shell; a bolt received within the bolt carrier; a firing pin configured to strike a primer end of the shotgun shell when the bolt carrier is in the forward position; and an ejector assembly including an ejector pin and ejector hook, wherein the ejector assembly is configured to expel the fired shotgun shell from the chamber when the bolt carrier travels to the rearward position.
  • the barrel assembly comprises a barrel having a receiver end and a muzzle end and a tubular sidewall defining an open bore; a barrel extension coupling the receiver end of the barrel to the upper receiver housing; and a barrel nut adapted to releasably secure the barrel and barrel extension to the upper receiver housing
  • the gas piston assembly comprises a piston body having a first end and a second end, wherein the first end of the piston body includes a tab slidably received within a corresponding slot defined by the barrel extension; a piston end cap coupled to the second end of the piston body; a piston bonnet having a bonnet end wall and a sidewall configured to slidably receive the piston end cap therein, wherein the piston bonnet is secured to the barrel an intermediate distance between the receiver end and the muzzle end of the barrel, wherein a piston gap is defined between the piston end cap and the bonnet end wall, and wherein the barrel sidewall defines a gas port fluidly connecting the open bore of the barrel with the piston gap; and a biasing member urging
  • a gas piston assembly suitable for use within a modular firearm.
  • the gas piston assembly comprises a piston apparatus having a first end and a second end wherein the piston apparatus is configured to be coaxially mounted onto a barrel of the modular firearm; a piston bonnet configured to be coaxially mounted onto the barrel, the piston bonnet having a bonnet end wall with a bonnet aperture defined therethrough and a bonnet sidewall configured to slidably receive the second end of the piston apparatus therein, wherein a piston gap is defined between the second end of the piston apparatus and the bonnet end wall and is in communication with the bonnet aperture; and a selectively adjustable gas regulator in communication with the bonnet aperture and configured to selectively occlude the bonnet aperture in fully open, partially open and fully closed orientations.
  • Preferred features are set out in the dependent claims.
  • the bonnet end wall may also include a threaded bore perpendicular to and in communication with the bonnet aperture while the gas regulator includes a threaded shaft proportioned to be threadably received within the threaded bore and translatable to selectively occlude the bonnet aperture in the fully open, partially open and fully closed orientations.
  • the threaded shaft includes a head portion adapted to be gripped by a user to threadably translate the threaded shaft and a detent may be configured to engage one recess of a series of annularly spaced recesses defined on a bottom face of the head portion of the threaded shaft as the threaded shaft is rotationally translated.
  • Firearm 100 may be a modular firearm consisting of a number of components and subcomponents.
  • Major components of firearm 100 may include lower receiver assembly 110, upper receiver assembly 112, buttstock assembly 114 and barrel assembly 116.
  • upper receiver assembly 112 is coupled to lower receiver assembly 110 while buttstock assembly 114 is connected to the lower receiver assembly 110 and barrel assembly 116 is mounted onto upper receiver assembly 112.
  • Lower receiver assembly 110 is configured to include a magazine well 118 adapted to slidably receive a magazine 120 therein.
  • Magazine 120 may carry one more cartridges, bullets or shells 122 which may be serially loaded within a chamber 124 in upper receiver assembly 112. Activation of the firing mechanism (not shown) is controlled by trigger 126.
  • a grip 128 (such as a pistol grip, as shown) allows the user to aim and control the firearm while placing the user's trigger index finger in close proximity to the trigger. In this manner, the user can aim the firearm to the target and extend the trigger index finger to engage the trigger without losing control or accuracy of the firearm.
  • a charging handle assembly 107 including a charging handle 109 and release/retaining lever 111 is provided for opening and controlling a bolt carrier group (not shown) for maintenance, loading the first live unfired cartridge into chamber 124 and removing a live unfired cartridge from the chamber, as is known in the art.
  • Most assault-type firearms are configured to be operated as rifles and include a rifled barrel and are chambered to receiver and fire rifle cartridges.
  • the AR-15 ® firearm is generally chambered for standardized rounds such as the Remington .223 cartridge or the 5.56 ⁇ 45mm NATO military cartridge.
  • the major components of the AR-15 ® firearm have been standardized, with such standardization being generally referred to as meeting United States Military Standards or, more commonly as being "mil-spec”.
  • the terms "mil-spec” and “mil-spec M16/AR-15 ® firearm” shall refer to the structural specificities defined by the United States Department of Defense as of January 23, 2018 the date of filing of United States provisional patent application Serial No. 62/620439 .
  • Assault weapons such as the AR-15 ® firearm, have also been modified to chamber and fire .410 bore shotgun shells.
  • these firearms suffer from a number of drawbacks. For instance, 2.5 inch (63.5 mm) long shotgun shells tend to bind within the chamber and/or magazine thus leading to performance failures.
  • firearms have been modified such that the magazine well of the lower receiver is slightly larger than the standard AR-15 ® firearm magazine well such that the larger magazine well can receive a larger magazine such that the shotgun shells can be more repeatably extracted from the magazine and chambered within the upper receiver. This modification, however, renders the lower receiver assembly no longer mil-spec and also leads to difficulties when mating the upper and lower receivers.
  • an exemplary upper receiver and barrel assembly 200 in accordance with an aspect of the present disclosure may generally comprise an upper receiver 202, barrel assembly 204 and gas piston assembly 206.
  • upper receiver 202 includes an AR-15 ® firearm upper receiver body 208 configured to mount to a mil-spec AR-15 ® firearm lower receiver body.
  • upper receiver body 208 includes first and second nodules 209, 211 proportioned to rest within a notch or groove formed within the sidewalls of the mil-spec AR-15 ® firearm lower receiver body (not shown).
  • Each nodule and respective sidewall includes corresponding through-holes whereby a respective pin (not shown) may be inserted within each corresponding through-hole to secure the two receiver bodies together.
  • Upper receiver body 208 may originate as a mil-spec AR-15 ® firearm upper receiver but may be modified so as to define a chamber 210 that has been proportioned to accommodate 2.5 inch (63.5 mm) long .410 bore shotgun shell cartridges.
  • Ejection port 212 may also be enlarged in relation to a mil-spec AR-15 ® firearm upper receiver configured to fire rifle cartridges so as to provide additional clearance for ejection of the longer 2.5 inch (63.5 mm) 410 bore shotgun cartridge casings when compared to the shorter 1.76 inch long .223 Remington (5.56x45mm NATO) rifle cartridge casings.
  • upper receiver body 208 may be further modified to include provision of ejector hook 214 configured to engage an ejector pin 216 carried by bolt carrier group 221 as will be discussed in greater detail below.
  • Upper receiver body 208 may also include a notched portion 207 configured to receive a charging handle assembly, such as charging handle assembly 107 described above with reference to FIGS. 1 and 2 .
  • Bolt carrier group 221 may generally comprise bolt carrier 218, bolt 220, firing pin 222 and ejector pin 216.
  • Bolt carrier 218 may also include a groove 219 within which translates ejector hook 214 when bolt carrier group 221 cycles during operation, as will be discussed in greater detail below.
  • Upper receiver housing 208 may also include a forward assist 224 configured to manually advance bolt carrier 218 to its forward position, if necessary, as is known in the art.
  • the distal end of bolt 220 may include a bolt head 231 configured to extract and eject shotgun shell cartridges, as well as lock and unlock within barrel extension 228, as will be discussed in greater detail below.
  • bolt head 231 may include a cartridge guide 233 and opposing cartridge extractor 235.
  • Cartridge guide 233 may be integrally formed with bolt head 231.
  • Extractor 235 may generally comprise a T-shaped member, wherein the vertical trunk 235b is pivotally received within a cavity within the body of bolt head 231 via an extractor pin 237.
  • Proximal end 235c is configured to overlap extractor spring 239 whereby distal end 235d is biased toward extractor 233.
  • Cartridge guide 233 and extractor 235 may each include a respective hook 233a, 235a projecting inwardly toward the center of bolt head 231. Hooks 233a, 235a thereby define a rim gap 245a, 245b between each hook and face 247 of bolt head 231.
  • Bolt head 231 also defines a firing pin through bore 249 within which firing pin 222 may translate and an ejector through bore 251 within which translates ejector pin 216. The operation of each of these features will be described in greater detail below.
  • Barrel assembly 204 may include barrel 226, barrel extension 228 and barrel nut 230.
  • Barrel 226 comprises a generally tubular sidewall 232 defining an open bore 234 extending the length of barrel 226 from receiver end 236 to muzzle end 238.
  • Barrel extension 228 comprises a separate tubular member having a stepped outer wall thereby delineating barrel extension 228 into a barrel receiving portion 240 and bolt receiving portion 242.
  • Bolt receiving portion 242 includes an external annular ring 244 proximate step 246.
  • Receiver end 236 of barrel 226 may include male threads configured to engage corresponding female threads defined within inner wall surface 248 of barrel receiving portion 244 of barrel extension 228 so as to form a unitary barrel member 229.
  • Bolt receiver portion 242 of barrel extension 228 may then slide within the forward barrel receiving end 250 of upper receiver body 208 to mount barrel member 229 to upper receiver body 208.
  • inner wall surface 241 of bolt receiver portion 242 may include one or more generally T-shaped grooves 243 configured to lockingly receive detents 223 on bolt 220 as bolt 220 is rotated into the forward position via bolt cam 225 riding within carrier slot 227.
  • barrel nut 230 may comprise a generally tubular member having a stepped inner wall 252 including a step 254 defining an upper receiving portion 256 and a gas piston assembly portion 258.
  • Upper receiving portion 256 may include female threads configured to threadably engage male threads defined on forward barrel receiving end 250 of upper receiver body 208. In this manner, barrel nut 230 may be tightened onto upper receiver body 208 so as to capture barrel extension annular ring 244 between step 254 on barrel nut 230 and forward barrel receiving end 250 and secure barrel member 229 to upper receiver body 208.
  • a spaced distance 260 may be defined between inner wall 252 of gas piston assembly portion 258 of barrel nut 230 and outer wall surface 264 of barrel receiving portion 240 of barrel extension 228.
  • Barrel extension 228 may further define opposing slots 266 which are configured to slidably receive gas piston assembly 206 as will described in greater detail below.
  • Gas piston assembly 206 is configured to coaxially mount about barrel member 229 and includes a piston 279 generally comprised of a piston body 280 and piston head 292.
  • First end 282 of piston body 280 includes one or more tabs 284 wherein each tab 284 is configured to be slidingly received within a respective slot 266 define within barrel extension 228.
  • terminal ends 286 of each tab 284 are configured to engage respective tangs 288 on bolt carrier 218 upon firing of the shotgun cartridge (see FIGS. 5 , 7 and 12 ).
  • terminal ends 286 of each tab 284 abut against respective tangs 288 on bolt carrier 218 when bolt carrier 218 is in the forward position as shown in FIGS. 5 , 7 and 12 .
  • terminal ends 286 of each tab 284 are a spaced distance away from its respective tang 288 when bolt carrier 218 is in the forward position but are driven into contact with its respective tang 288 by operation of the gas evolved upon firing of the shotgun shell cartridge, as will be discussed in greater detail below.
  • Piston head 292 generally includes a piston end cap 294 coupled to a piston bushing 296 at a first end 295, such as through a threaded connection.
  • One or more small gas rings 298 may be interposed between flange 297 of piston end cap 294 and piston bushing 296 so as to form a gas-tight seal therebetween. Small gas rings 298 also form a gas-tight seal between piston head 292 and barrel 226.
  • First end 295 of piston end cap 294 (and piston bushing 296) may then be secured within a first end 300 of a piston coupling 302, such as through a threaded connection.
  • One or more large gas rings 304 may be interposed between flange 297 of piston end cap 294 and piston coupling 302 so as to form a gas-tight seal therebetween.
  • Second end 306 of piston coupling 302 may then be secured to second end 290 of piston body 280, such as through a threaded connection.
  • piston body 280 and piston head 292 may form a unitary body, i.e. piston 279.
  • gas piston assembly 206 further includes a bonnet 308, retaining ring 310 and bonnet cap 312.
  • Bonnet 308 includes a stepped sidewall 314 generally delineating a piston receiving portion 316 and bonnet cap receiving portion 318.
  • Piston receiving portion 316 is configured to slidingly encircle first end 300 of a piston coupling 302, piston end cap 294 and large gas rings 304.
  • Large gas rings 304 are proportioned so as to form a gas-tight seal between bonnet 308 and piston head 292.
  • Bonnet cap receiving portion 318 includes a stepped internal face 320 configured to receive retaining ring 310 and a threaded external face 322 configured to threadably receive bonnet cap 312 thereon.
  • a set screw 313 may releasably lock bonnet cap 312 on bonnet 308.
  • Retaining ring 310 is configured to reside within an annular recess 324 defined by recess walls 326 along barrel 226 (see FIG. 4 ) and may be comprised of two generally C-shaped members. Retaining ring 310 may thus operate as a piston stop along the length of barrel 226. For instance, bonnet 308 is prevented from lateral travel toward muzzle end 238 through engagement of retaining ring 310 upon recess wall 326. Piston coupling 302, and thus piston 279, is in turn prevented from lateral travel toward muzzle end 238 by engagement of coupling step 328 of piston coupling 302 against terminal end 330 of bonnet 308.
  • a piston gap 332 is defined between flange 297 of piston end cap 294 and bonnet end wall 334. Piston gap 332 is positioned to coincide with a gas port 336 defined within barrel sidewall 232 so as to create a fluid pathway between open bore 234 and piston gap 332.
  • the longitudinal axis of gas port 336 may be oriented at an angle A with respect to the longitudinal axis of bore 234 of barrel 226.
  • angle A is selected to be between about 5° and about 90°, between about 30° and about 60°, or about 45°, although any angle may be defined so long as gas port 336 operates in accordance with the teachings of the present invention, as will be discussed in greater detail below.
  • a biasing member such as piston spring 340, may urge piston 279 toward the inner surface 342 of bonnet end wall 334.
  • first end 344 of piston spring 340 may rest upon end face 346 of barrel nut 230 while second end 350 may rest against end face 352 of piston coupling 302.
  • FIGS. 11-19 operation of the various features of the exemplary upper receiver and barrel assembly 200 are shown.
  • the firearm is loaded with a shotgun shell cartridge (not shown) and is ready to be fired. That is, the rimmed edge of a .410 bore shotgun shell cartridge is received within rim gap 245a, 245b such that the primer end of the sell cartridge lies flush against bolt head face 247 (see e.g., FIGS. 8 and 11 ).
  • piston 279 is in the forward position with coupling step 328 contacting terminal end 330 of bonnet 308 and tabs 284 of piston 279 contacting tangs 288 on bolt carrier 218.
  • tabs 284 of piston 279 may initially be a spaced distance from tangs 288 on bolt carrier 218.
  • a volume of hot, high pressure gas 354 is evolved. High pressure gas 354 travels down barrel 226 toward muzzle end 238 and operates to propel and expel the shotgun shell contents (i.e., bird shot, buckshot or slugs) out of barrel 226.
  • gas port 356 is configured to be at about a 45° angle toward receiver end 236.
  • Gas port 356 may have an internal diameter between about 0.0625 inches and about 0.125 inches, or between about 0.090 inches and 0.095 inches. In this manner, a suitable volume and pressure of gas portion 356 may be introduced into piston gap 332.
  • gas portion 356 continues to translate piston 279 and bolt carrier group 221 in direction F until piston end cap 294 clears terminal end 330 of bonnet 308 whereby gas portion 356 may vent to atmosphere. Travel of piston 279 in direction F may also be halted by physical engagement of first end 282 of piston body 280 against step 246 of barrel extension 228 (i.e., gap 260 is closed); see FIG. 17 . Upon venting of gas portion 356, piston 279 may then return to the forward position by traveling in opposing direction R as indicated generally by arrow 360 due to the release of the stored potential energy in piston spring 340. First end 300, large gas rings 304 and piston end cap 294 of piston 279 may then reset within bonnet 308 as described above in preparation of firing the next shotgun cartridge.
  • bolt carrier group 221 may unlock from barrel extension 228 ( FIG. 18 ), such as through rotation of cam 258 in carrier slot 227 (see FIG. 4 ), and thereby continue to travel in direction F due to inertia (along with the fired, empty shell).
  • Inertia (along with the fired, empty shell).
  • ring portion 215 of ejector pin 216 to engage flange 213 of ejector hook 214 while the remainder of bolt carrier group 221 continues to travel in direction F.
  • pin extension 217 of ejector pin 216 may then extend outwardly of bolt 220 into chamber 210 so as to engage the rimmed edge of the fired, empty shotgun shell (not shown).
  • ejector pin 216 engages the rimmed edge of the fired, empty shotgun shell proximate cartridge guide 233 so as to apply a force off-center from the central axis of the shotgun shell. Application of force against one side of the shell may cause the rimmed edge to slip past extractor 235 so as to "flip" the used shell from the bolt. In this manner, the fired shotgun shell may be ejected through ejection port 212.
  • extractor 235 may pivot about extractor pin 237, thereby compressing extractor spring 239 and opening rim gap 245a so as to assist ejection of the fired, empty shotgun shell. Once the shell has been ejected, the potential energy within the compressed extractor spring may be released, thereby returning extractor 235 to its original position.
  • Travel of bolt carrier group 221 in direction F against a buffer spring housed within the buttstock assembly causes potential energy to be stored within the buffer spring, as is known in the art.
  • a buffer spring housed within the buttstock assembly
  • travel of bolt carrier group 221 in direction F is arrested.
  • the buffer spring may then release its stored potential energy so as to redirect bolt carrier group 221 in the opposing direction R.
  • bolt 220 may then extract the next available shotgun shell cartridge from the magazine (not shown, see e.g., FIG. 2 ).
  • Bolt carrier group 221 continues to travel in direction R until the new, live shotgun shell cartridge is seated within the chamber and bolt 220 reseats within barrel extension 228 as shown in FIGS. 5 and 6 , such as through reverse rotation of cam 258 in carrier slot 227 and locking of detents 223 on bolt 220 within T-shaped grooves 243 defined by barrel extension 228 (see e.g., FIG. 7 ).
  • cartridge guide 233 and extractor 235 are driven against the rimmed end of the new, live shotgun shell cartridge such that the rimmed edge travels down the ramped face of hooks 233a, 235a until the rimmed edge slides past the hooks and rests within rim gap 245a, 245b.
  • extractor 235 may pivot about extractor pin 237, thereby compressing extractor spring 239 and opening rim gap 245a so as to assist seating of the new, live shotgun shell cartridge within rim gap 245a, 245b.
  • ejector hook 214 may be pivotally mounted in upper receiver 202 such that ejector flange 213 may be pivotally withdrawn from bolt carrier 218 so that bolt carrier group 221 may be slidably removed from upper receiver 202 without requiring removal of ejector hook 214.
  • Upper receiver 202 and bolt carrier group 221 may then be cleaned and maintained in accordance with the art.
  • specifications of the various components must be tightly controlled to ensure proper operation of the firearm, such as and without limitation thereto, the weight, density, surface contact/friction, gap dimension and location, and spring constants.
  • gas port 336 must be dimensioned, located and oriented such that sufficient gas volume and pressure is delivered to piston 279 to impart the needed kinetic energy to bolt carrier group 221.
  • Piston head 292 must also be properly sealed within bonnet 308 to minimize, and preferably prevent, leakage of gas portion 356 prior to the complete travel of piston 279 and venting of gas portion 356 as described above.
  • the length of piston receiver portion 318 of bonnet 308 and the length of gap 260 must be proportioned such that piston 279 may sufficiently impart enough kinetic energy to bolt carrier group 221 while also allowing piston 279 to be reset within bonnet 308 prior to firing of the next successive shotgun shell cartridge.
  • piston 279 will not provide sufficient kinetic energy to bolt carrier group 221 to permit ejection of the fired shotgun shell and extraction of the next successive cartridge from the magazine.
  • piston head 292 may travel too far in direction F such that it may not sufficiently reset within bonnet 308 prior to firing of the next shotgun shell cartridge.
  • the gas portion introduced upon firing of the next shotgun shell cartridge would not provide sufficient volume and/or pressure of gas to piston 279, which in turn would lead to insufficient cycling of bolt carrier group 221.
  • piston head 292 will never clear terminal end 330 of bonnet 308 such that gas portion 356 will not vent to atmosphere.
  • piston 279 will be prevented from resetting within bonnet 308, thereby rendering the firearm unusable.
  • the spring constant for each of the buffer spring and piston spring 340 must be selected to enable proper cycling of bolt carrier group 221 and piston 279. That is, the size and spring constant of the buffer spring must be such that the spring constant is low enough that bolt carrier group 221 may travel sufficiently in direction F so as to eject the fired shotgun shell, but be high enough to recycle bolt carrier group 221 in direction R to extract the next successive shotgun shell cartridge and reseat bolt 220 in barrel extension 228 while also preventing bolt carrier group 221 from violently striking the buttstock.
  • piston spring 340 The size and spring constant of piston spring 340 must be such that the spring constant is low enough that piston 279 may travel sufficiently in direction F so as to impart the needed kinetic energy to bolt carrier group 221 while also being high enough to reset piston head 292 within bonnet 308 as described above.
  • Upper receiver and barrel assembly 400 generally comprises an upper receiver 402, barrel assembly 404, gas piston assembly 406 and handguard 407.
  • upper receiver 402 includes an AR-15 ® firearm upper receiver body 408 configured to mount to a mil-spec AR-15 ® firearm lower receiver body.
  • upper receiver body 208 includes first and second nodules 409, 411 proportioned to rest within a notch or groove formed within the sidewalls of the mil-spec AR-15 ® firearm lower receiver body (not shown) and include a through-hole for receiving a pin to secure the two receiver bodies together.
  • Upper receiver body 408 may originate as a mil-spec AR-15 ® firearm upper receiver but may be modified so as to define a chamber 410 that has been proportioned to accommodate 2.5 inch (63.5 mm) long .410 bore shotgun shell cartridges. Ejection port 412 may also be enlarged in relation to a mil-spec AR-15 ® firearm upper receiver configured to fire rifle cartridges so as to provide additional clearance for ejection of the longer 2.5 inch (63.5 mm) .410 bore shotgun cartridge casings when compared to the shorter 1.76 inch long .223 Remington (5.56x45mm NATO) rifle cartridge casings. Upper receiver body 408 may also include a charging handle assembly 405 similar to charging handle assembly 107 described above with reference to FIGS. 1 and 2 . Upper receiver housing 408 may further receive a bolt carrier group therein, such as bolt carrier group 221 as described above, and may also include a forward assist 424 configured to manually advance the bolt carrier to its forward position, if necessary, as is known in the art.
  • barrel assembly 404 Coupled to upper receiver 402 is barrel assembly 404, which is similar to barrel assembly 204, described above. Accordingly, barrel nut 430 may be tightened onto upper receiver body 408 so as to secure barrel 426 to upper receiver body 408 via male threads 449 on forward barrel receiving end 450. As shown most clearly in FIG. 21 , barrel nut 430 may also define a pair of annular grooves 432 which are positioned so as to receive a respective set screw 434 on handguard 407, as will be described in greater detail below.
  • Gas piston assembly 406 is substantially identical to gas piston assembly 206 except bonnet 308 has been swapped for bonnet 508 and piston spring 340 has been omitted.
  • the remaining components of the gas piston assembly (piston 479 including piston body 480 and piston head 492 which includes piston end cap 494 and piston bushing 496; small gas rings 498; piston coupling 502; large gas rings 504; retaining ring 510 and bonnet cap 512) are substantially the same and operate in a generally identical manner as their corresponding components within gas piston assembly 206 (piston 279 including piston body 280 and piston head 292 which includes piston end cap 294 and piston bushing 296; small gas rings 298; piston coupling 302; large gas rings 304; retaining ring 310 and bonnet cap 312), with the exception of the adjustability of the evolved gas, which will be discussed in greater detail below with regard to bonnet 508.
  • bonnet 508 is similar to bonnet 308 described above and includes a stepped sidewall 514 generally delineating a piston end wall 534 located between a piston receiving portion 516 and bonnet cap receiving portion 518.
  • Piston receiving portion 516 is configured to slidingly encircle first end 500 of a piston coupling 502, piston end cap 494 and large gas rings 504.
  • Bonnet cap receiving portion 518 includes a stepped internal face 520 configured to receive retaining ring 510 and a threaded external face 522 configured to threadably receive bonnet cap 512 thereon.
  • a set screw similar to set screw 313 ( FIG. 4 ), may releasably lock bonnet cap 512 on bonnet 508.
  • Retaining ring 510 is configured to reside within an annular recess 524 defined by recess walls 526 along barrel 426 and may be comprised of two generally C-shaped members. Retaining ring 510 may thus operate as a piston stop along the length of barrel 426. For instance, bonnet 508 is prevented from lateral travel toward muzzle end 438 through engagement of retaining ring 510 upon recess wall 526. Piston coupling 502, and thus piston 479, is in turn prevented from lateral travel toward muzzle end 438 by engagement of coupling step 528 of piston coupling 502 against terminal end 530 of bonnet 508.
  • a piston gap 532 is defined between flange 597 of piston end cap 494 and bonnet end wall 534.
  • Bonnet end wall 534 defines a bonnet aperture 533 therethrough which communicates with gap 532.
  • Piston gap 532 is positioned to coincide with a gas port 536 defined within barrel sidewall 432 so as to create a fluid pathway between open bore 434 and piston gap 532 and bonnet aperture 533.
  • the longitudinal axis of gas port 536 may be oriented at any angle with respect to the longitudinal axis of bore 434 of barrel 426 and, in one aspect of the present invention, is selected to be about 90°.
  • bonnet 508 toward receiver end 436 is prevented by the threaded engagement of bonnet cap 512 to bonnet 508 and the interference of retaining ring 510 against internal face 538 of bonnet cap 512.
  • piston 479 is free to slidably translate along barrel 426 toward receiver end 436 as will be discussed in greater detail below.
  • a volume of hot, high pressure gas 554 is evolved.
  • High pressure gas 554 travels down barrel 426 toward muzzle end 438 and operates to propel and expel the shotgun shell contents (i.e., bird shot, buckshot or slugs) out of barrel 426.
  • a portion 556 of the gas is directed into piston gap 532 by way of gas port 536.
  • High pressure gas portion 556 is then further apportioned between a recharge portion 558 and a waste portion 560. Waste portion 560 is vented to atmosphere by passing through bonnet aperture 533.
  • the firearm operator needs to control the magnitude of the recharge portion 558 apportioned to cycle the bolt carrier group and piston assembly, as described above. That is, should the volume/pressure of the recharge portion 558 be too high, piston body 480 will drive the bolt carrier group rearward with too great a force, which in turn will compress the buffer spring with too great a force which may cause the buffer weight to strike the rear wall (buttplate) of the buttstock, thereby potentially damaging any or all of the piston, bolt carrier group, buffer weight, buffer spring or buttstock.
  • piston body 480 will impact the bolt carrier group with insufficient force to fully cycle the bolt carrier group. As a result, the discharged shotgun shell may not be properly ejected and/or the next shotgun shell cartridge may not be properly extracted from the magazine and loaded within the chamber.
  • gas piston assembly 406 may include a selectively adjustable gas regulator 562 in communication with bonnet aperture 533.
  • Gas regulator 562 may comprise a threaded shaft 564 having a first end 566 adapted to be threadably received within a threaded bore 568 defined within bonnet end wall 534, wherein threaded bore 568 is in fluid communication with bonnet aperture 533.
  • first end 566 of threaded shaft 564 may be selectively positioned within threaded bore 568 and extend within bonnet aperture 533 so as to selectively occlude bonnet aperture 533 in a fully open orientation (first end 566 completely removed from bonnet aperture 533), a fully closed orientation (first end 566 abuts against or sits within a recess 570 defined within inner wall 535 of bonnet end wall 534) and a partially open orientation intermediate the fully closed and fully opened orientations.
  • the maximum amount of waste portion 560 is vented to atmosphere with the minimum amount of recharge portion 558 impacting piston 479.
  • substantially all of high pressure gas portion 556 is directed as recharge portion 558 so as to impart maximum force to piston 479.
  • Minimal, if any, gas may escape bonnet aperture 533 as waste portion 560.
  • the ratio of recharge portion 558 to waste portion 560 may thus be selectively adjustable by selectively advancing or retreating threaded shaft 564 until first end 566 sufficiently occludes bonnet aperture 533 to permit proper cycling of the bolt carrier group and piston 479 as described above.
  • threaded shaft 564 may include a second end 572 having a head portion 574 that is adapted to be gripped by the firearm operator so as to incrementally translate threaded shaft 564.
  • head portion 574 may be externally located relative to handguard body 576 of handguard 407 wherein handguard body 576 defines a regulator aperture 578 which is configured to overlap threaded bore 568 such that threaded shaft 564 may pass through handguard body 576 and threadably engage threaded bore 568 as described above.
  • bottom face 580 of head portion 574 may include a series of annularly spaced recess 582.
  • a detent 584 may be mounted onto the firearm so as to engage a selected recess 582'.
  • handguard body 576 may include a detent aperture 586 which is configured to secure detent housing 588 of detent 584 therein.
  • Detent housing 588 may then include a spring 590- loaded detent pin 592 configured to resiliently reside within selected recess 582'.
  • Head portion 574 may also include indicia (not shown) or the firearm operator may otherwise take note of the detent pin/recess 592/582 and threaded shaft 564 position for each specific shotgun shell cartridge intended to be used within the firearm.
  • the operator may quickly and accurately adjust the ratio of recharge portion 558 to waste portion 560 so as to ensure proper cycling of the bolt carrier group and piston as described above.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Claims (17)

  1. Gaskolbenbaugruppe (406), die zur Verwendung innerhalb von einer modularen Feuerwaffe geeignet ist, wobei die Gaskolbenbaugruppe (406) Folgendes umfasst:
    a) eine Kolbenvorrichtung mit einem ersten Ende und einem zweiten Ende, wobei die Kolbenvorrichtung dafür konfiguriert ist, um koaxial auf einem Lauf (426) der modularen Feuerwaffe montiert zu werden;
    b) eine Kolbenhaube (508), die dafür konfiguriert ist, um koaxial auf dem Lauf (426) montiert zu werden, wobei die Kolbenhaube (508) eine Haubenendwand (534) mit einer durch sie hindurch definierten Haubenöffnung (533) und eine Haubenseitenwand (514) aufweist, die so konfiguriert ist, dass sie das zweite Ende der Kolbenvorrichtung verschiebbar darin aufnimmt, wobei ein Kolbenspalt (532) zwischen dem zweiten Ende der Kolbenvorrichtung und der Haubenendwand (534) definiert ist und in Verbindung mit der Haubenöffnung (533) steht; und
    c) einen selektiv einstellbaren Gasregler (562), der mit der Haubenöffnung (533) in Verbindung steht und so konfiguriert ist, dass er die Haubenöffnung (533) in vollständig geöffneter, teilweise geöffneter und vollständig geschlossener Ausrichtung selektiv verschließt.
  2. Gaskolbenbaugruppe (406) nach Anspruch 1, wobei die Haubenendwand (534) eine Gewindebohrung (568) einschließt, die senkrecht zur Haubenöffnung (533) verläuft und mit dieser in Verbindung steht, und wobei der Gasregler (562) einen Gewindeschaft (564) umfasst, der so bemessen ist, dass er schraubbar innerhalb von der Gewindebohrung (568) aufgenommen ist und verschiebbar ist, um die Haubenöffnung (533) in der vollständig geöffneten, der teilweise geöffneten und der vollständig geschlossenen Ausrichtung selektiv zu verschließen.
  3. Gaskolbenbaugruppe (406) nach Anspruch 2, wobei der Gewindeschaft (564) einen Kopfteil (574) einschließt, der angepasst ist, um von einem Benutzer ergriffen zu werden, um den Gewindeschaft (564) schraubbar zu verschieben.
  4. Gaskolbenbaugruppe (406) nach Anspruch 3, wobei der Gasregler (562) eine Arretierung (584) einschließt, die so konfiguriert ist, dass sie in eine Aussparung einer Reihe von ringförmig beabstandeten Aussparungen eingreift, die auf einer Bodenfläche des Kopfteils (574) des Gewindeschafts (564) definiert sind, wenn der Gewindeschaft (564) in Drehung verschoben wird.
  5. Gaskolbenbaugruppe (406) nach Anspruch 1, wobei die Kolbenvorrichtung einen Kolbenkörper (480), der das erste Ende und das zweiten Ende umfasst, und einen mit dem zweiten Ende des Kolbenkörpers (480) gekoppelten Kolbenkopf (492) einschließt, wobei der Kolbenkopf (492) verschiebbar innerhalb von der Kolbenhaube aufgenommen ist und wobei der Kolbenspalt zwischen dem Kolbenkopf (492) und der Haubenendwand definiert ist.
  6. Gaskolbenbaugruppe (406) nach Anspruch 5, ferner eine Baugruppe aus oberem Verschlussgehäuse und Lauf umfassend, die dafür konfiguriert ist, an einem unteren Verschlussgehäuse montiert zu werden und eine Schrotpatronenhülse aufzunehmen und abzufeuern, wobei die Baugruppe aus oberem Verschlussgehäuse und Lauf Folgendes umfasst:
    a) ein oberes Verschlussgehäuse, das Folgendes umfasst:
    i) einen oberen Verschlussgehäusekasten (408), der eine Kammer definiert, die dafür konfiguriert ist, die Schrotpatronenhülse in derselben aufzunehmen; und
    ii) eine Bolzenträgergruppe (221), die Folgendes einschließt:
    a) einen Bolzenträger, der verschiebbar innerhalb des oberen Verschlussgehäusekastens (408) aufgenommen ist, wobei sich der Bolzenträger auf ein Abfeuern der Schrotpatronenhülse hin von einer vorderen Position zu einer hinteren Position bewegt;
    b) einen Bolzen, der innerhalb des Bolzenträgers aufgenommen ist; und
    c) einen Zündstift, der dafür konfiguriert ist, ein Zündhütchenende der Schrotpatronenhülse anzuschlagen, wenn sich der Bolzenträger in der vorderen Position befindet;
    b) eine Laufbaugruppe (404), die Folgendes umfasst:
    i) einen Lauf (426), der ein Verschlussgehäuseende und ein Mündungsende und eine röhrenförmige Seitenwand, die eine offene Bohrung definiert, aufweist;
    ii) eine Laufverlängerung, die das Verschlussgehäuseende des Laufs mit dem oberen Verschlussgehäusekasten verbindet;
    wobei die Gaskolbenbaugruppe (406) koaxial auf dem Lauf (426) montiert ist, wobei die Lauf-Seitenwand (432) eine Gasentnahmebohrung definiert, die die offene Bohrung des Laufs (426) mit dem Kolbenspalt und der Haubenöffnung fluidisch verbindet; wobei die Haubenendwand eine Gewindebohrung einschließt, die mit der Haubenöffnung in Verbindung steht, und wobei der Gasregler (562) einen Gewindeschaft umfasst, der ein erstes Ende aufweist, das so bemessen ist, dass es schraubbar innerhalb von der Gewindebohrung aufgenommen ist und verschiebbar ist, um die Haubenöffnung in der vollständig geöffneten, der teilweise geöffneten und der vollständig geschlossenen Ausrichtung selektiv zu verschließen; und
    c) einen Handschutz (407), der an der Laufbaugruppe (404) angebracht ist, wobei der Handschutz (407) einen Handschutzkörper (576) einschließt, der eine Regleröffnung (578) definiert, die so konfiguriert ist, dass sie die Gewindebohrung (568) überlappt, die innerhalb der Haubenendwand definiert ist, wodurch das erste Ende des Gewindeschafts (564) durch die Regleröffnung (578) hindurchgeht, um in die Gewindebohrung (568) einzugreifen.
  7. Gaskolbenbaugruppe (406) nach Anspruch 6, wobei die Längsachse der Gasentnahmebohrung (536) in einem Winkel im Verhältnis zu der Längsachse des Laufs (526) liegt.
  8. Gaskolbenbaugruppe (406) nach Anspruch 7, wobei der Winkel 90 Grad beträgt.
  9. Gaskolbenbaugruppe (406) nach Anspruch 6, wobei der Kolbenkopf (492) ferner Folgendes einschließt:
    eine Kolbenendkappe (494);
    eine Kolbenbuchse (496), die das zweite Ende des Kolbenkörpers mit der Kolbenendkappe (494) verbindet; und
    eine Kolbenkupplung (502), die das zweite Ende des Kolbenkörpers, die Kolbenbuchse und einen Abschnitt der Kolbenendkappe in derselben aufnimmt,
    wobei der Kolbenkörper, die Kolbenendkappe, die Kolbenbuchse und die Kolbenkupplung ein einheitliches Element bilden.
  10. Gaskolbenbaugruppe (406) nach Anspruch 9, wobei der Kolbenkopf (492) ferner Folgendes einschließt:
    eine oder mehrere kleine Gasdichtungen zwischen der Kolbenbuchse und der Kolbenendkappe; und
    eine oder mehrere große Gasdichtungen zwischen der Kolbenendkappe und der Kolbenkupplung,
    wobei der Kolbenkörper, die Kolbenendkappe, die Kolbenbuchse, die Kolbenkupplung, die kleinen Gasdichtungen und die großen Gasdichtungen ein einheitliches Element bilden.
  11. Gaskolbenbaugruppe (406) nach Anspruch 6, wobei die Gaskolbenbaugruppe ferner Folgendes einschließt:
    iv) einen Haltering (510), der innerhalb einer ringförmigen Aussparung (524) aufgenommen ist, die innerhalb des Laufs (426) definiert ist; und
    v) eine Haubenkappe (512), welche die Kolbenhaube an dem Haltering und dem Lauf befestigt.
  12. Gaskolbenbaugruppe (406) nach Anspruch 6, wobei der Gewindeschaft (564) ein zweites Ende mit einem Kopfteil (574) einschließt, der angepasst ist, um von einem Benutzer ergriffen zu werden, um den Gewindeschaft (564) schrittweise zu verschieben.
  13. Gaskolbenbaugruppe (406) nach Anspruch 12, wobei der Gasregler (562) eine Arretierung (584) einschließt, die so konfiguriert ist, dass sie in eine ausgewählte Aussparung einer Reihe von ringförmig beabstandeten Aussparungen eingreift, die auf einer Bodenfläche des Kopfteils (574) des Gewindeschafts (564) definiert sind, wenn der Gewindeschaft (564) in Drehung verschoben wird.
  14. Gaskolbenbaugruppe (406) nach Anspruch 13, wobei der Kopfteil (574) von dem Gewindeschaft (564) relativ zum Handschutzkörper (407) außen positioniert ist.
  15. Gaskolbenbaugruppe (406) nach Anspruch 14, wobei die Arretierung (584) ein Arretierungsgehäuse (588) und einen Arretierungsstift (592) umfasst, der über eine Arretierungsfeder vom Arretierungsgehäuse (588) nach außen vorgespannt ist, und wobei der Handschutzkörper ferner eine Arretierungsöffnung definiert, die so konfiguriert ist, dass sie das Arretierungsgehäuse (588) am Handschutzkörper (407) montiert, wodurch der Arretierungsstift (592) durch die Arretierungsfeder vorgespannt wird, um in die ausgewählte Aussparung an der Bodenfläche des Kopfteils einzugreifen.
  16. Gaskolbenanordnung (406) nach Anspruch 6, wobei die Gewindebohrung (568) senkrecht zur Haubenöffnung verläuft.
  17. Gaskolbenanordnung (406) nach Anspruch 6, wobei das obere Verschlussgehäuse ein oberes Verschlussgehäuse einer Feuerwaffe vom Typ M16/AR-15 ® ist, das dafür konfiguriert ist, um an einem unteren Verschlussgehäuse einer Feuerwaffe vom Typ M16/AR-15 ® montiert zu werden.
EP21160552.2A 2020-03-03 2021-03-03 Oberes waffengehäuse für modulare schrotflinte Active EP3875881B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16/807,624 US11125516B2 (en) 2018-01-22 2020-03-03 Upper receiver for modular shotgun

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EP3875881B1 true EP3875881B1 (de) 2024-09-25
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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8528458B2 (en) * 2011-07-27 2013-09-10 Bernard T. Windauer Pressure-regulating gas block
US9500422B2 (en) * 2014-07-02 2016-11-22 Beretta Usa Corp. Gas operating system for small arms with spring loaded gas valve
CA2985386C (en) 2015-05-08 2021-09-14 Anthony Dichario Shotgun shell magazine
US10578381B2 (en) * 2018-01-22 2020-03-03 American Tactical, Inc. Upper receiver for modular shotgun
US10670356B2 (en) * 2018-04-27 2020-06-02 Vasym Tadzhi Retrofit adjustable gas valve for long-stroke piston-operated firearm

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EP3875881C0 (de) 2024-09-25
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