Abstract: Disclosed is a connector for hingedly mounting a buttstock to a receiver of a rifle having a swinging hinge portion, a buttstock side of the swinging hinge portion, an interface side of the swinging hinge portion, a threaded portion of the swinging hinge portion, a buffer hole extending from the interface side, through the swinging hinge portion, and through the threaded portion, a recess on the interface side of the swinging hinge portion, a bolt, and a base of the bolt rotationally constrained in the recess.

Abstract: A device implementable on a firearm includes a forward assist assembly which is configured to be installed on an upper receiver of the firearm. When pressed, the forward assist assembly moves along a longitudinal axis thereof to engage with a serration cut on a bolt carrier of the firearm to push the bolt carrier forward with respect to the upper receiver when pressed. The forward assist assembly includes a modular component slidingly attachable to and detachable from the forward assist assembly.

Abstract: A cover for a receiver of a gun that may include an elongated member having a first longitudinal axis, the elongated member including a distal end portion which may include a leading edge which is configured and dimensioned to connect with a gun part, and a proximal end portion which is spaced from the distal end portion along the first longitudinal axis. The elongated member may include a first locking mechanism adjacent the proximal end wall. The first locking mechanism may be secured to a recoil spring guide of the gun. Also, the elongated member may include a second locking mechanism adjacent the distal end portion. The second locking mechanism may be secured to a rear sight base of the gun. The elongated member may include an accessory rail.

Abstract: A forward assist that includes at least some of a plunger; a partially rotatable, spring biased pawl extending from a portion of the plunger; a projection extending from a first end of the plunger; and at least one head having a recess formed in at least a portion of the, wherein the head recess is mateable with the projection of the plunger, and wherein the head is secured to a first end of the plunger via interaction of the projection and the head recess.

Abstract: An improvised guide rod assembly for semiautomatic firearms is provided for adjusting the tensile force on a spring internal to the firearm. The assembly included a guide member distending distally from the firearm's forward components, creates a tension in the mechanical workings of the firearm during discharge, and enhances accuracy, bullet velocity, and defensive functionality. A guide rod positions inside a firearm guide channel, protruding outside the firearm from a distal end. The guide member passes through a similarly sized and dimensioned spring. Tension on the spring transfers to an adjacent firearm slide member, whereby during discharge of the firearm, the slide member meets resistance while in motion. Using the adjustable guide rod to realize spring resistance increases, the velocity of a bullet is improved as is control of the firearm after recoil. The guide rod also serves as a close proximity weapon.

Abstract: A modified bolt carrier for automatic recoil rifles and pistols preferably includes a shortened bolt carrier, a shortened buffer tube, a modified bolt key and an end cap. The shortened buffer tube is shortened by cutting-off a straight portion of a prior buffer tube. The modified bolt key includes a prior art bolt key, a rod yoke, a pair spring rods, a pair of compression springs, a spring support disc and a spring plug. The spring plug is biased outward from the shortened bolt carrier with the pair of compression springs. The modified bolt key is attached to the shortened bolt carrier and retained in upper and lower receivers of an automatic recoil rifle or pistol. The bolt spring is slipped over the spring plug and the bolt spring is retained by securing the end cap to the lower receiver with a lock pin.

Abstract: Apparatuses and methods for facilitating reloading and resisting recoil of a firearm include an elastic member in communication with a portion of the firearm. A contact member coupled to the portion of the firearm, the elastic member, or combinations thereof, is movable between a first position in which movement of the portion of the firearm is biased by the elastic member and a second position in which movement of the portion of the firearm is generally unaffected by the elastic member. An actuator can be used to move the contact member between the first and second positions.

Abstract: A recoil mechanism for an auto-loading firearm, having a gas-operated action bar assembly. One or more compression springs are used, mounted on associated retaining rods contained in a stationary orientation on the firearm. The springs are linked to the firearm's gas system at one end, and bear against stops affixed to ends of the spring retaining rods. The entire mechanism is contained within a forward grip mounted on the firearm, the grip optionally being provided with mounting rails.

Abstract: Disclosed herein is a modified upper receiver assembly and method of assembly, which in one form is operatively configured to be fitted to a conventional lower receiver of a rifle so the user can use their normal lower receiver having a pistol grip, trigger assembly and butt stock. The upper receiver is configured to provide a blowback bolt assembly of larger mass than would be possible with similar density materials of a bolt fitted within an upper receiver conventionally made for said lower receiver.

Abstract: An upper receiver assembly for a firearm having an upper receiver with an integral barrel nut, a handguard assembly and a barrel nut assembly with a barrel and lock nut is provided. The barrel is received by the upper receiver and is secured directly to the upper receiver using the lock nut. The upper receiver also includes an integral handguard mounting member to which the handguard assembly may be directly attached. The upper receiver assembly allows the user to attach both the barrel and handguard assemblies directly to the upper receiver, independently of one another.

Abstract: In embodiments, a modular rifle includes a lower receiver assembly, an upper receiver assembly, and a coupling mechanism. The upper receiver contains a bolt carrier and a housing enclosing the recoil spring and rod. Within the housing is a counter bore shoulder against which the recoil spring rests. Integrated into the top face of the bolt carrier are compartments, upon which the housing is mounted. Holes in the front of the housing and the upper receiver assembly accommodate the rod. Containing the recoil spring and rod within in the housing mounted to the bolt carrier allows the modular rifle to have a folding, collapsible, or otherwise non-fixed stock. Attached to the rod is a retaining tab, the depression of which allows for the release of the upper receiver from the lower receiver for disassembly of the rifle.

Abstract: A rifle includes an upper receiver body, a lower receiver body detachably attached to the upper receiver body, a stock and a bolt carrier group. The upper receiver body has a bolt carrier receiving bore exposed at a stock engaging portion thereof. The stock includes a recoil spring receiving bore therein exposed at a mounting portion thereof. The mounting portion of the stock is engaged with the stock engaging portion of the lower receiver body in a manner whereby the recoil spring receiving bore is accessible from the bolt carrier receiving bore. A centerline axis of the recoil spring receiving bore is skewed with respect to a centerline axis of the bolt carrier receiving bore. The bolt carrier group has a bolt carrying structure slideably disposed within the bolt carrier receiving bore, a recoil spring engaging structure slideably disposed within the recoil spring receiving bore and a linkage member structure pivotably engaged between the bolt carrying structure and the recoil spring engaging structure.

Abstract: In weapon shot is fired during counterrecoil. The counterrecoil energy damps the recoil energy. During recoil, the breech block is unlocked, the spent cartridge case is ejected from the barrel by the residual pressure of the powder gases and is directed by a deflector into a hole in the gun carriage. When recoiling into the aftmost position, the barrel approaches the projectile and locks it by means of the breech block. Meanwhile, the next cartridge is taken from a magazine. In the event of misfire, the barrel, continuing to counterrecoil, actuates an extractor for removing the defective projectile. A recoil imitator returns the barrel to the aftmost position, where it is loaded with a projectile in a manner similar to the post-firing recoil. The technical result is ability to load the weapon automatically before firing or to reload the weapon automatically in the event of misfire.

Abstract: In embodiments, a modular rifle includes a lower receiver assembly, an upper receiver assembly, and a coupling mechanism. The upper receiver contains a bolt carrier and a housing enclosing the recoil spring and rod. Within the housing is a counter bore shoulder against which the recoil spring rests. Integrated into the top face of the bolt carrier are compartments, upon which the housing is mounted. Holes in the front of the housing and the upper receiver assembly accommodate the rod. Containing the recoil spring and rod within in the housing mounted to the bolt carrier allows the modular rifle to have a folding, collapsible, or otherwise non-fixed stock. Attached to the rod is a retaining tab, the depression of which allows for the release of the upper receiver from the lower receiver for disassembly of the rifle.

Abstract: In weapon shot is fired during counterrecoil. The counterrecoil energy damps the recoil energy. During recoil, the breech block is unlocked, the spent cartridge case is ejected from the barrel by the residual pressure of the powder gases and is directed by a deflector into a hole in the gun carriage. When recoiling into the aftmost position, the barrel approaches the projectile and locks it by means of the breech block. Meanwhile, the next cartridge is taken from a magazine. In the event of misfire, the barrel, continuing to counterrecoil, actuates an extractor for removing the defective projectile. A recoil imitator returns the barrel to the aftmost position, where it is loaded with a projectile in a manner similar to the post-firing recoil. The technical result is ability to load the weapon automatically before firing or to reload the weapon automatically in the event of misfire.

Abstract: A firearm includes a closing device of operative side ports of a receiver, a bolt assembly and the receiver equipped on at least one side with an operational port. The bolt assembly includes a bolt, a bolt-holder slide carrying a cocking handle and an inertial return element of the bolt-slide. The closing device includes at least one cover which is movable along a longitudinal rail from an advanced engagement position with the at least one operational side port and a withdrawn disengaged position. The inertial element includes a first spring and a second spring applied in series on the longitudinal rail. A supporting device of the at least one cover is assembled axially and slides along the longitudinal rail between the first spring and the second spring.

Abstract: A blow-back operating automatic firearm has a sliding mass carried with its bolt carrier assembly to increase the dwell time of the bolt at the breech when the bolt is in battery position for firing. The sliding mass reduces the tendency of the bolt to bounce-off the head end of the seated cartridge, thereby reducing the risk that a misfiring will occur.

Abstract: An inexpensive generally retrofitable drop-in cartridge-unit of light-weight pneumatic-cylinder design for replacing the conventional metal/compression-spring member housed within the frame of a gun, thereby providing significantly smoother, quiter, more rapid, and more reliable cyclic-action upon firing of the gun. The preferred embodiment cartridge-unit is internally configured whereby a near constant spring-load rise is provided as the bolt-action slides aftward, thereby effectively spreading resultant recoil-action inertial-kickback more evenly throughout the bolt-travel. Hence, substantially reducing disturbing kickback, enabling a more rapid succession of shots per given shot-grouping owing to the shooter's improved recovery-time. Various iterations are set forth, including those of single, double, and tripple telescopic-action, and a hybrid/metal-pneumatic variant, as well as generic-variants providing manual and automatic pneumatic-pressure adjustment.

Abstract: An apparatus 10 is provided for initially slowing a backwards extraction movement of a bolt group 12 of a weapon which moves backward automatically after firing and against a force of a return drive spring 14. The apparatus includes first and second longitudinal members 16, 30 having respective distal ends and proximal ends. A mounting mechanism is provided for mounting the first and second members for longitudinal movement of the first member relative to the second member and adjacent the drive spring, with the drive spring urging the first and second members apart and against the bolt group. A retarding mechanism 36 is provided for retarding an initial backwards movement of the first proximal end relative to the second distal end, and for allowing a relatively free further backwards movement of the first proximal end relative to the second distal end as the bolt group moves backwards after firing.

Abstract: The invention comprises an improved recoil control device comprising a bolt head and an inertia block or slider for use in a variety of firearms. In one embodiment, the bolt head and inertia block are articulated so that the displacement of the bolt head results in a force component outside the firing axis of the barrel of the firearm. The device can be incorporated into firearms of a variety of sizes and configurations to produce recoil reduction and/or weight reduction advantages.

Abstract: An inexpensive generally retrofitable drop-in cartridge-unit of light-weight pneumatic-cylinder design for replacing the conventional metal/compression-spring member housed within the frame of a gun, thereby providing significantly smoother, quiter, more rapid, and more reliable cyclic-action upon firing of the gun. The preferred embodiment cartridge-unit is internally configured whereby a near constant spring-load rise is provided as the bolt-action slides aftward, thereby effectively spreading resultant recoil-action inertial-kickback more evenly throughout the bolt-travel. Hence, substantially reducing disturbing kickback, enabling a more rapid succession of shots per given shot-grouping owing to the shooter's improved recovery-time. Various iterations are set forth, including those of single, double, and tripple telescopic-action, and a hybrid/metal-pneumatic variant, as well as generic-variants providing manual and automatic pneumatic-pressure adjustment.

Abstract: An open bolt firing mechanism for programmable cartridges. The mechanism includes a firing bolt having a bolt face configured to engage a programmable cartridge and force the programmable cartridge toward a barrel of the weapon. The mechanism also includes a cradle connected to the bolt for holding the programmable cartridge in a position adjacent to the bolt. The cradle stabilizes the cartridge so that fusing information may be transferred to the programmable cartridge.

Abstract: A spring closing assembly is disclosed which is adapted to be selectively installed and removed from a firearm. The illustrated spring closing assembly includes a rod having a free forward end which defines a slot dividing the free forward end into fork prongs. The assembly also includes a spring mounted on the rod, and a projecting part located on a first one of the fork prongs. At least the first fork prong is resiliently displaceable in an inward direction. The assembly also includes a washer dimensioned to be forced onto the free end of the rod by inwardly displacing the first fork prong. At least one of the projecting part and the washer is chamfered to promote the inward displacement of the first fork prong. The washer is captured between the projecting part and the spring.

Abstract: A pistol caliber conversion assembly having a slide assembly housing components of lightweight characteristics so as to accept and permit an interchange of a variety of caliber ammunition. The assembly includes a rail and groove arrangement for slidably mounting a slide housing onto the frame and a recoil mechanism for urging a barrel into a reset position after firing. An open lock mechanism selectively engages the slide housing with the frame and sets to an automatic open position upon ejecting of a last round from the ammunition chamber. The critical selection of high strength-to-weight ratio materials permits machining away of excess materials to reduce weight while maintaining sufficient hardness and mass to handle firing loads.

Abstract: An improved recoil spring tube assembly for an auto-loading firearm includes a recoil spring slideable within a recoil spring tube and including a recoil spring follower all manufactured of a corrosion resistant material. The bore of the recoil spring tube and the contact surface area of the guide collar of the recoil spring follower are honed or polished to provide a surface having an average surface roughness between 1.0 &mgr;in. and 30.0 &mgr;in. The recoil spring tube assembly is configured such that the recoil spring has a spring rate greater than 0.80. In one embodiment of the invention, the recoil spring tube assembly includes a recoil spring follower sized and configured so as to have a mass that results in an assembly wherein the ratio of the recoil spring follower mass to the recoil spring rate, or displacement constant is in the range of 0.10-0.30.

Abstract: A spring closing assembly is disclosed which is adapted to be selectively installed and removed from a firearm. The illustrated spring closing assembly includes a rod having a free forward end which defines a slot dividing the free forward end into fork prongs. The assembly also includes a spring mounted on the rod, and a projecting part located on a first one of the fork prongs. At least the first fork prong is resiliently displaceable in an inward direction. The assembly also includes a washer dimensioned to be forced onto the free end of the rod by inwardly displacing the first fork prong. At least one of the projecting part and the washer is chamfered to promote the inward displacement of the first fork prong. The washer is captured between the projecting part and the spring.

Abstract: An unlocked self-loading pistol and a conversion kit for modifying a locked self-loading pistol adapted for firing normal and powerful cartridges into an unlocked self-loading pistol capable of firing weak cartridges as well as normal and powerful cartridges is disclosed. The unlocked self-loading pistol includes a return spring which is closely surrounded on the outside by a sleeve composed of an elastomer material. The length of the elastomer sleeve corresponds approximately to the length of the compressed return spring. The sleeve absorbs a part of the movement energy of the breech and passes it on into the grip. The conversion kit can be used to convert a locked self-loading pistol into an unlocked self-loading pistol as stated above and vice versa. The disclosed conversion kit includes: an alternate barrel which does not come into locked engagement with the breech, the abovementioned elastomer sleeve, and, optionally, a substitute return spring.

Abstract: A buffer assembly for use with firearms such as the M-16 rifle, for reducing the cyclic rate of firing in full-automatic operation. The buffer assembly includes a unit of length selected to stop the bolt carrier at the desired full-recoil position, and a mass movable relative to that unit. When the bolt carrier stops at full-recoil, inertia causes the mass to continue moving rearwardly while further compressing the action spring. The action spring then returns that mass forwardly to contact the fixed portion of the buffer assembly, returning the bolt carrier to battery position. The bolt carrier remains at rest in recoil while the moveable weight slides rearwardly and then returns forwardly relative to the bolt carrier, thereby increasing the cycle time of firing and correspondingly reducing the cyclic rate of fire for the firearm.

Abstract: A recoil mechanism used to return the slide of a semi-automatic handgun back to its battery position after firing is provided having a recoil spring, a rod member and a discrete flange member. The rod and the flange member each of polymeric material have a flange at one end thereof which retain the recoil spring disposed therebetween. The recoil mechanism is assembled by coaxially fitting the recoil spring onto the rod and then snap fitting the flange member onto the one end of the rod.

Abstract: A semiautomatic firearm including a recoil spring acting on the bolt for closing the breech after the ejection of the case. The repositioning device includes an auxiliary resilient member which cooperates with the recoil spring, so that although a low-rigidity spring suitable for weak cartridges is used, the weapon works correctly even when firing powerful cartridges. The device thus allows to use a wider range of cartridges and reduces the negative effects of recoil.

Abstract: A secondary recoil absorption mechanism absorbs some of the recoil energy associated with the firing of the firearm. The secondary recoil absorption mechanism includes a roller mounted on the breech block to engage a ramp element pivotally mounted on the frame of the firearm. The ramp element includes a rounded corner against which the roller abuts. The ramp element is connected to a cocking lever by a roller mounted in a guide groove defined on a cocking lever. The cocking lever is moved manually to move the ramp rounded corner out of the path of movement of the breech block mounted roller and to move the breech block into a cocked position held behind a sear. The guide groove includes a plurality of sections.

Abstract: A hand firearm with a casing in which the system is arranged and a valve leading from the inside of the casing to the outside which is so designed that an overpressure in the casing may be vented to the outside, in which a gas-permeable, heat conducting solid medium is arranged in the region of the valve in the flow path of the gas leaving via the valve in order to prevent any danger from hot gases being forced out of the weapon.

Abstract: A recoil spring assembly for use with a semi-automatic firearm having a slide. The assembly has an elongate guide, an elongate coil spring mounted over the guide, and an end cap snap locked onto the guide. The assembly also has a washer movably mounted on the guide. The spring is retained on the guide between the end cap and the washer. The guide has a ledge to prevent the washer from being pushed off a first end of the guide by the spring. The assembly can be inserted into and removed from the firearm without risk of the spring becoming dismounted from the guide.

Abstract: A system for movably positioning a first member relative to a second member. The system has a hole in the first member and a coiled spring/plunger member positioned in the hole. The coiled member has a section that extends out of the hole that does not possess significant spring properties and thus can act as a plunger. The plunger section of the coiled member can be moved in and out of an aperture to the hole without risk of damage. Thus, the second member can be moved relative to the first member by compressing the coiled member or moving away from the coiled member and, the coiled member can position the second member relative to the first member while at rest.

Abstract: An automatic machine pistol is provided, which is not subject to fouling, which is compact and light while incorporating a pneumatic recoil buffer, which resists muzzle climb, and which can be accessed and cleaned without disassembly. The machine pistol is comprised of a reciprocating bolt within a housing of the pistol. The reciprocating bolt is carried within the housing on four rails by eight roller bearings. No sliding contact is made between the bolt and any other portion of the pistol. A portion of the high pressure gas from the barrel is bled through a bleed hole in the barrel block or barrel into a gas port tube which is telescopically inserted into the bolt. The gas port tube delivers the portion of the discharge gas in a forward direction in opposition to the motion on recoil. An upwardly directed nozzle is communicated to the receiving bore within the bolt.

Abstract: A projectile firing weapon is disclosed having a simplified construction and a consequent increase in reliability. The trigger and firing mechanism are completely contained within an easily removable and replaceable cassette which may simply be dropped into a cavity in the weapon's stock. The entire barrel assembly may be attached to the stock by a single bolt and a pivoting attachment. The pivoting attachment allows the ready replacement of the barrel assembly or the ready replacement of the firing mechanism actuator cassette should either of them malfunction. The stock and hand grip may be formed of a single piece to further simplify the construction of the weapon.

Abstract: A relatively simple repeating firearm is disclosed which includes a sliding bolt which is removably housed within a firearm housing and which is biased into a bullet loading and firing position by means of springs provided in an overlapping fashion with a longitudinal extent of the bolt to thereby reduce the overall length of the firearm. A short stroke for the sliding bolt is provided to enable a rapid firing of the firearm. The sliding bolt and firing mechanism contained thereon are easily removed from the housing by a removable rear cover with the firearm accommodating different calibers of bullets by replacement of the sliding bolt as well as a removable barrel which contains the firing chamber therein.

Abstract: Automatically feeding firearm having a bolt (2) which upon shooting is reciprocally moving in the receiver (1) of the weapon actuated by a recoil spring (4), and in which the bolt (2) when being set for firing its first shot, for the purpose of executing its function, is pulled back and is kept tensioned in the receiver until a trigger bar or a similar lock means releases the bolt, or alternatively the bolt is directly returned to a front position after having brought a cartridge from the magazine into a cartridge position and after having tensioned a separate firing mechanism, and in which the weapon is formed with an actuation bar (5) projecting from the back (9) of the weapon and adapted for tensioning the bolt (2) by being pulled rearwardly, which bar after said tensioning of the bolt is adapted to be returned to its initial front position.

Abstract: A repeating weapon in which its bolt carrier is slotted to enable an actuating spring to move laterally, carrying with it a gas piston. The spring is anchored to the receiver in such a way as to be anchored or released by axial movement. This enables a quick and simple field stripping sequence.

Abstract: A semi-automatic pistol comprises a spring driven mobile striker assembly. t its rear the spring is coiled on a post and abuts an aft stationary plate. The striker assembly comprises an integral rear plate with a hole adapted for the penetration of the post and spring and having at the front side of the hole a hollow cylindrical sleeve adapted to accommodate the post and spring during recoil.

Abstract: A breech/receiver assembly for automatic cannon incorporates a rotating chamber and a recoil and counterrecoil buffer integrated within the breech. The breech, including the buffer means, recoils with the barrel and because the mass of the buffer is added to the breech and barrel, recoil forces transferred to trunions mounting the breech/receiver assembly are significantly reduced. The configuration of the breech/receiver assembly, including the rotating chamber and integrated recoil/counterrecoil buffer, enables a shorter receiver, thereby enabling a vehicle-mounted cannon utilizing the breech/receiver assembly of the present invention to elevate to high angles while still maintaining a relatively low gun silhouette.

Abstract: For an automatic or semi-automatic weapon or gun, that includes a top strap for covering an open top portion of a weapon receiver group. The invention in a connector-less locking arrangement for that top strap that includes spaced apart flanges arranged at intervals along the top strap undersurface to project outwardly from the sides thereof to fit and travel beneath inwardly facing rail sections formed in the receiver top edges, and includes a detent fitted into the receiver to project therefrom, that, when the top strap is fitted thereover, travels into a seat formed in the top strap undersurface, aligning and maintaining the top strap in covering engagement over that receiver open open top portion.

Abstract: A fully gas operated pistol includes a frame unit, a barrel unit, a bolt carrier unit slidably supported on the frame unit and a spring which urges the bolt carrier unit into a forward, bolting position. A path links the breech end of the barrel with a rearward pointing cavity near the muzzle end of the barrel. The cavity is adapted to accommodate a piston of the bolt carrier unit. Gases expanding upon the firing of a bullet expand under pressure into the piston accommodating cavity, thus causing the bolt carrier unit to retract.

Abstract: In a locked-breech, short recoil, pistol type fire arm, the breech block slide (B) is provided with a separate locking block (E) engageable with both the barrel (C) and the slide (B) and accommodated between the underside of the barrel (C) and the upper surface of a movable trigger guard (D). Hold open means (X) are provided operable in the absence of cartridges in a magazine (T) or in the breech to allow the slide (B) to be held in the fully retracted position and simultaneously to release the trigger guard (D) for limited forward and downward movement, the trigger guard being provided with means which on movement of the trigger guard cause the locking block (E) to disengage from the barrel, whereby the barrel can be removed without the need for further disassembly of the fire arm.

Abstract: A recoil spring system for a self-loading pistol type fire arm having a reciprocating breech block slide comprises a pair of compression springs (P) located in respective tunnels (B1, B2) in the side walls of the slide (B), each said spring abutting at its front end against the front inner wall (B9) of the slide and at its rear end against a stop (A1, A2) on the frame (A), which stop on recoil of the slide passes through a slot (B7, B8) at the rear of the slide connecting the tunnel to an external surface of the slide. The springs can be kept safely in the slide even after disassembly thereof from the fire arm.

Abstract: With an automatic or semi-automatic weapon or gun, an improved component coupling arrangement for providing interlocking component assemblies of the receiver and barrel groups of the weapon, where, with a single screw coupling only in conjunction and interaction with a connector-less receiver top strap, the barrel and receiver groups are rigidly joined together, maintaining a cartridge feed block therewith that has a throat for receiving cartridges fed therethrough, which throat is in alignment with and between a barrel breech and in a cartridge discharge of a magazine juxtaposed thereto positioned to and between the barrel and receiver groups.

Abstract: The invention concerns an automatic, mass-obturated hand firearm comprising a body (1) with handle (2), a barrel (3) joined to the body, a breech block (4) with guide (5) constituted by the body and with cocking and firing mechanism (7), the guide of the breech block ascending rearward so that the rearward path of motion of the breech block deviates upward from the center-line (8) of the barrel. The purpose is to eliminate the problem of automatic hand firearms that during shooting the barrel tends to rise upwards.As taught by the invention, when the breech block (4) is in its forward position its center of gravity (9) is located forward of the handle (2). The breech block (4) is preferably disposed to have its major part forward of the rear end (10) of the barrel (3). Furthermore, the center of gravity (9) of the breech block (4) is preferably located forward of the rear end (10) of the barrel (3).

Abstract: A locked breach, gas operated long action firearm capable of firing heavy caliber shotgun or rifle shells with substantially reduced recoil. The gas piston and bolt carrier assembly are supported for recoil movement along a single guide rod which extends the entire length of the gun, permitting a longer recoil path resulting in reduced impulse due to recoil. The guide rod has a noncircular or radially-assymmetrical cross-section mating with a corresponding opening in the gas piston, so that the bolt carrier assembly remains in alignment over the entire recoil path. Separate close-bolt and open-bolt embodiments are disclosed, and the open-bolt embodiment is selectively capable of firing either semi-automatic or full-automatic while permitting reliable cartridge feeding from a box or drum magazine.

Abstract: A bolt carrier assembly has a housing (300) for supporting a bolt (317) and a P cross-sectionally shaped member (301) having the longer side of the P-shape secured to the housing, the P-shaped member being forwardly extended with respect to the bolt. The main drive spring (307) is located alongside the wrapped-over portion of the P-shaped member which main drive spring is arranged to provide motion to the housing and P-shaped member. An anti-bounce weight (354) is mounted inside the wrapped-over part of the P-shaped member and has a spring at one end which is compresed by the anti-bounce weight when the P-shaped member is suddenly retarded by the housing to which it is attached striking the barrel assembly. A latch (326-329) is spring biassed and shaped and dimensioned to interleave locking lugs (322) on the bolt (317), the latch being longitudinally retractable with respect to the housing.

Abstract: A muzzle ejecting sabot cartridge firearm system for use in a weapon having an elongated gun barrel, an action mechanism, and an elongated bolt mounted within the bore of the action mechanism. The bore of the action mechanism and the bore of the gun barrel are in co-axial alignment and the forward end of the action mechanism is in communication with the rear end of the gun barrel. The bolt has an elongated bore extending inwardly from its base end that communicates with a relieved portion in the front face of the bolt to allow passage of gases released from a cartridge that has been fired. The diameter of the bore of the action mechanism is greater than the diameter of the bore of the gun barrel thereby forming a shoulder at the front end of the action mechanism that functions to capture the peripheral rim along the back end of a sabot cartridge at the initial stage of firing the cartridge.