Abstract: A firing mechanism provides a secondary interface between a hammer and a sear of a firearm that will automatically be engaged in case a primary interface between the hammer and the sear fails. In various embodiments, an actuator is employed to facilitate engagement of the primary and secondary interfaces.

Abstract: A recoil assembly for a rifle includes a baseplate comprising a baseplate body extending longitudinally along a central axis from a proximal end to a distal end, the baseplate body defining an opening extending along the central axis and configured to receive an end of a recoil spring guide rod. A latch plate extends up from the top surface of the baseplate body, the latch plate defining a charging handle opening a catch surface for a charging handle latch. In use, the recoil baseplate can be received in an aperture defined in the upper receiver of a rifle, where one or more recoil spring guide rods are received in the opening in the baseplate body. A charging handle can be slidably received through the charging handle opening and charging handle aperture of the upper receiver.

Abstract: A breechblock assembly for a firearm includes a guiding element having a slide adapted to slide along a guide in an actuation system of the breechblock assembly driven by a motor. A shutting element shuts an opening in a breech ring of the firearm. A percussion pin is pushed by an elastic element slide along a longitudinal axis, as a function of the firing cycle of the firearm to an axial hole in the shutting element. The percussion pin is shaped to partially come out of the axial hole of the shutting element for firing a piece of ammunition. The breechblock assembly comprises a control system for controlling the percussion pin. The control system controls the operability and the movement of the percussion pin independently of a firing cycle of the firearm.

Abstract: Firearm safing assemblies and firearms including the same are disclosed. In embodiments firearm safing assemblies include a safing sector with a track surface and a receiver door track. The receiver door track may couple to a receiver of a rotatable firearm, wherein the receiver includes a bolt track and at least a portion of the receiver extends coaxially about a first axis. The safing sector is configured to be at least partially disposed within the receiver door track and to move between a safe position and an armed position. In the safe position the track surface is out of alignment with and does not form part of the bolt track, whereas in the armed position it is aligned with and forms part of the bolt track.

Abstract: In a high-pressure pump, a center of load in a virtual plane including an end face of a coil spring facing a pressurizing chamber in an axial direction is defined as an upper load center, and a center of load in a virtual plane including an end face of the coil spring facing a cam in the axial direction is defined as a lower load center. The coil spring is configured such that, when viewed in the axial direction, during motion of a plunger toward the pressurizing chamber by rotation of the cam, the upper load center moves in one direction along a circumference of the coil spring while the lower load center moves in an opposite direction along the circumference of the coil spring, and the lower load center substantially coincides with the upper load center and subsequently further moves in the opposite direction.

Abstract: A firearm includes a frame to which a barrel and slide are slideably mounted and in which a magazine is slideably received. A bumper telescoped on a push rod slideable with the slide pushes a shell in the magazine onto a pivotal carrier. Locking wings pivotally mounted to the barrel are cammed in troughs of a cam block as the barrel and the slide parallel to the longitudinal axis of the barrel relative to the cam block, so that lock tabs are removably received in locking recesses in the slide to removably lock the barrel and slide together. A trigger is slideably mounted to the frame for movement parallel to the longitudinal axis of the barrel for pivoting a sear lever engagable with a biased striker and moving a safety from an interfering position relative to the striker.

Abstract: An internal firing pin safety mechanism for a pistol, for example an M1911 80-Series pistol, which is activated by the beaver tail, rather than the trigger. The mechanism's constituents are comprised of a beaver tail, which engages a beaver tail lever when gripped, which in turn engages a plunger lever. The plunger lever then pushes up a firing pin block that has a concave opening, which allows the firing pin to pass through and strike the pistol's chamber.

Abstract: A bolt for a firearm includes, among other things, a bolt body extending between a first bolt end and a second bolt end, the bolt body defining a shaped cavity adjacent to a breech lock recess. The shaped cavity is defined by a cavity floor extending between a forward cavity face and a rear cavity face, the forward cavity face defines a forward angle relative to the cavity floor, the rear cavity face defines a rear angle relative to the cavity floor, and each of the forward angle and the rear angle is acute. A bolt assembly for a firearm and a method of fabricating a bolt for a firearm are also disclosed.

Abstract: A semiautomatic firearm with a reciprocating bolt assembly has delayed blowback and a firing pin block. The firearm is particularly suitable for firing necked rimfire cartridges with a high level of reliability. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback. The bolt may interface with the necked rimfire cartridge using a undercut engagement on the forward end of the bolt. The semiautomatic firearm also may incorporate one or both of a dual trigger arrangement as part of a trigger and firing mechanism.

Abstract: A firearm having a lower receiver is provided. The receiver is adapted to couple with a plurality of upper receivers having different calibers. The lower receiver comprises a receiver extension having an opening therein. A spring is disposed within the opening. A buffer member is provided having a first portion having an end. The buffer member is coupled to the spring within the opening, wherein the buffer member is movable between a first position where the end is within the opening and a second position wherein the end external to the opening.

Abstract: An automatic or semi-automatic rifle. The rifle has a receiver and a bolt having a striking surface, the bolt enclosed within the receiver. A barrel has a bore, the barrel coupled to the receiver. An indirect gas operating system has a cylinder and a piston, the indirect gas operating system mounted with a mounting structure substantially independent of the barrel. The cylinder is in communication with the bore, and the piston is fitted to the cylinder and disposed for striking the striking surface and displacing the bolt assembly.

Abstract: A firearm having a lower receiver is provided. The receiver is adapted to couple with a plurality of upper receivers having different calibers. The lower receiver comprises a receiver extension having an opening therein. A spring is disposed within the opening. A buffer member is provided having a first portion having an end. The buffer member is coupled to the spring within the opening, wherein the buffer member is movable between a first position where the end is within the opening and a second position wherein the end external to the opening.

Abstract: A sear trip bar for use in an automatic firearm is disclosed. In accordance with some embodiments, the sear trip bar can be operatively interfaced with the bolt carrier and the automatic sear of the host firearm. The disclosed sear trip bar can be configured such that, upon sufficient displacement thereof (e.g., exhaustion of its stroke length) by the bolt carrier, the automatic sear may be caused to trip. Thus, the disclosed sear trip bar can be utilized, for example, to transfer the force of the moving bolt carrier during a given firing cycle to automatically trip the sear so as to initiate one or more subsequent firing cycles without having to release and again operate the trigger of the host firearm. The disclosed sear trip bar can be utilized, for example, in pistol-caliber and/or rifle-caliber automatic firearms.

Abstract: An automatic or semi-automatic rifle. The rifle has a receiver and a bolt having a striking surface, the bolt enclosed within the receiver. A barrel has a bore, the barrel coupled to the receiver. An indirect gas operating system has a cylinder and a piston, the indirect gas operating system mounted with a mounting structure substantially independent of the barrel. The cylinder is in communication with the bore, and the piston is fitted to the cylinder and disposed for striking the striking surface and displacing the bolt assembly.

Abstract: An automatic sear assembly for providing a large-bore rifle with full-automatic firing and/or burst firing capabilities is disclosed. In accordance with some embodiments, the disclosed assembly includes an automatic sear operatively configured with a sear lever which is provided with bidirectional articulation for selectively imparting torque on the automatic sear to cause tripping thereof. For example, the disclosed assembly can be configured such that rotational deflection of the sear lever away from the automatic sear imparts no rotation thereto, whereas rotational deflection of the sear lever toward the automatic sear imparts rotation thereto. Thus, and in accordance with some embodiments, the disclosed sear assembly can be used in a rifle, for example, to utilize the force of a moving bolt carrier during a given firing cycle to initiate a subsequent firing cycle without need to release and once again operate the trigger of the rifle.

Abstract: An actuation system includes a bolt carrier assembly configured for use within a firearm, the bolt carrier assembly including a firing pin configured for striking a chambered round. A hammer assembly is configured for striking the firing pin of the bolt carrier assembly. An auto sear assembly is configured to actuate the hammer assembly during operation of the firearm. A linkage assembly is configured to couple the bolt carrier assembly and the auto sear assembly and effectuate the auto sear assembly actuating the hammer assembly.

Abstract: A firearm has a frame with a barrel connected to the frame and defining a barrel axis. The barrel has a rear end defining a chamber, and a bolt assembly reciprocates with respect to the chamber between a closed position adjacent the chamber, and an open position away from the chamber. A fire control assembly includes a trigger and a selector switch with a semi-automatic position and a fully-automatic position. The fire control assembly includes a bolt assembly sear operably engaging the bolt. The fire control assembly operates when the selector switch is in the semi-automatic position in response to pulling the trigger to discharge the firearm, to load a cartridge, and to position the bolt in the closed position. The fire control assembly operates when the selector switch is in the fully-automatic position in response to pulling the trigger to discharge the firearm, and to hold the bolt in the open position.

Abstract: In an automatic rifle which has been converted for non-military purposes to be semi-automatic by the removal of parts that allow its automatic function, additional suppressing elements are provided to ensure that the interruptor remains depressed until the bolt carrier fully passes the striker catch before the striker catch is engaged by the interruptor. This prevents premature connection of the striker catch and the interruptor, which could prevent sufficient striker spring pressure so that the next round can be fired. In one embodiment the trigger mechanism is fitted with an additional suppressing element (10) formed as a side push plate 7 on the bridge (6) of bolt carrier (5).

Abstract: A firearm fire control assembly for disposition in a forwardly placed support-hand operative relationship within a firearm having a combination of a firing pin and a firearm hammer adapted to engage and fire a cartridge, a sear assembly to alternately engage and disengage the combination of the firearm hammer and firing pin, and a trigger assembly including a movable trigger mechanism that is operable to engage the sear assembly to cause the firearm hammer firing pin combination to fire the firearm, a fire control assembly including a fire control depression member and a fire control rod operably connected to the depression member, and being positioned in a forward disposition disposed within a forestock of the firearm, and the depression member adapted to be operably engaged and depressed by the user's conventional forwardly placed support hand to maneuver the fire control rod to provide firing control of the firing of the firearm.

Abstract: A firearm includes a frame and a slide. A firing mechanism for the firearm includes a striker-type firing pin, a trigger, and a trigger bar. A sear inside the frame is pivotally balanced about a central fulcrum, and is biased in a first pivotal direction by a spring. In this position, a rear portion of the sear engages the firing pin. Actuation of the trigger causes the trigger bar to move rearwards for engagement of a forward portion of the sear. This pivots the sear in a second pivotal direction, against the spring, which releases the firing pin. The spring then causes the sear to pivot back for reengaging the firing pin when it returns to its rear position. Movement of the slide to a retired position causes the trigger bar to disengage from the sear (preventing discharge of the firearm) until the slide returns to a battery position.

Abstract: A portable firearm employs a frame and an upper mechanism having a bolt and a sliding hammer. A barrel assembly is supported on the frame and has an axis, a muzzle and a breech. The sear transversely straddles the barrel assembly and can project above its axis for restraining the hammer. A trigger mechanism employs a reciprocatable member coupled to the sear for selectively operating the sear automatically or semi-automatically. An intervening member is mounted to reciprocate transversely to the axis of the barrel assembly. This intervening member can retract upon the hammer moving against the intervening member. The intervening member is bifurcated to straddle and reciprocate transversely to the axis of the barrel assembly.

Abstract: A functioning mechanism for a small caliber automatic weapon includes a translatable and rotatable sear, and a rotatable hammer. The sear includes a hooking element adapted to contact a bearing surface of the hammer to render the hammer immobile. Rotating movement of the sear is controlled by the hammer in such a way as to obtain clean contact between the hooking element and the bearing surface.

Abstract: The invention relates to a tripping mechanism for semiautomatic and automatic firearms with a closed-type bolt carriage and which can be used in either a single shot firing mode or an automatic firing mode. The mechanism has a sear 4 slidably fitted on the trigger between the oscillating pivot 5 of the trigger and a resting plane 6a formed on the trigger, away from the pivot. The sear is stressed by a spring 11 which normally pushes it towards the hammer to interact with the latter. The sear 4 is susceptible to movement with the trigger when the trigger is operated and is also susceptible to a longitudinal sliding on the trigger in one direction due to spring 11 and in the opposite direction due to the hammer at least during the engaging in armed position phase, as well as the balancing phase between oscillating pivot 5 and resting plane 6a.

Abstract: A firearm having a hammer and a bolt mechanism capable of recoil movement behind the hammer, so that the bolt assembly in recoil momentarily clears the hammer. A timing lever senses rearward travel of the bolt assembly and prevents the hammer from release, irrespective of trigger mechanism operation, while the bolt assembly is momentarily behind the hammer. The hammer timing lever is engaged by the forwardly-moving bolt assembly to release the hammer and return control of the hammer to the trigger mechanism.

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 machinegun pistol is described, which can be reliably switched between semi and full automatic modes by an operator holding the gun in a natural two-hand grip. The gun includes a bolt (20, FIG. 1) and a firing pin device 22 that each slide longitudinally, a trigger assembly with a primary sear (28) that is depressed by the trigger for semiautomatic operation, and an auto control member (34) that can be depressed to switch to full automatic operation. When the control member is depressed, it connects a secondary sear (36) with the primary sear. The bolt carries a cam (40) that can depress the secondary sear (36) when the bolt moves forward, to thereby repeatedly depress the primary sear (28) when the two sears are connected during automatic operation. The control member (34) is operated by depressing it into the frame, to avoid errors in the heat of battle. The depressable control member (34, FIG.

Abstract: The automatic fire arm is provided with a bolt and hammer which reciprocate along the axis of the barrel. A first spring normally biases the bolt against the breech end of the barrel and a second spring normally biases the hammer against a firing pin which is slidably mounted within the bolt. A moveable retaining lever is pivotally mounted below the chamber in which the bolt and hammer are located. An upwardly extending projection is provided on each end of the lever which is extendable into the chamber through axially spaced apertures. A trigger mounted pin normally holds the lever with the rearmost projection extending into the chamber so that upon retraction of the bolt and hammer the hammer will be held in cocked position by the rearmost projection when the bolt returns to engage the breech end of the barrel.

Abstract: An open bolt firing mechanism for an automatic firearm (10) has a reciprocating bolt assembly (20) with a sear abutment (32) which is engaged by a searing surface (46) on a hammer (36) during counter-recoil for terminating forward movement of the bolt assembly in a cocked position. An automatic sear (56) serves to pivot the hammer downwardly and produce disengagement of the sear abutment of the bolt assembly and the searing surface on the hammer which allows the bolt assembly to move into the battery position. A connector (76), which is pivotable in response to the pulling of a trigger (86), functions to displace the automatic sear for producing downward pivoting of the hammer. The automatic sear has a searing surface (54) which engages a sear abutment (52) on the hammer for retaining the hammer in a cocked position. A shoulder (106) on the bolt carrier (20a) of the bolt assembly is adapted to engage a leg (68) on the automatic sear as the bolt assembly moves into the battery position.

Abstract: A machine gun pistol is described, which can be reliably switched between semi and full automatic modes by an operator holding the gun in a natural two-hand grip. The gun includes a bolt (20, FIG. 1) and a firing pin device (22) that each slide longitudinally, a trigger assembly with a primary sear (28) that is depressed by the trigger for semiautomatic operation, and an auto control member (34) that can be depressed to switch to full automatic operation. When the control member is depressed, it connects a secondary sear (36) with the primary sear. The bolt carries a cam (40) that depresses the secondary sear (36) every time the bolt moves forward, to thereby repeatedly depress the primary sear (28) when the two sears are connected during automatic operation. The control member (34) is operated by depressing it into the frame, to avoid errors in the heat of battle. The depressable control member (34, FIG.

Abstract: An automatic weapon firing mechanism consisting of a slideably movable bolt arrier with cam slots cooperating with pins on the bolt and firing pin for rotating the bolt to lock it in battery position for firing and to cock the firing pin during recoil. Continued forward movement of the carrier after the bolt is locked causes the firing pin to sear off and strike the chambered cartridge. The firing pin has its own firing spring so that a constant reliable striking force is applied to the cartridge. Gas from the spent cartridge recoils the bolt carrier, unlocking the bolt and cocking the firing pin during recoil.

Abstract: A belt-fed, gas-operated, air cooled automatic firearm having a novel mechanism for transferring link-connected ammunition rounds from a novel ammunition magazine to a feed position in an automatic firearm and having a novel sear mechanism including an anti-bounce sear for preventing a bolt carrier from bouncing away from the firing position adjacent the firearm barrel.

Abstract: A trigger mechanism for an automatic weapon which has a bolt carrier recicatably mounted in a receiver and biased to slide from a recoiled position to a firing position. The mechanism has a hammer positioned alongside the bolt carrier and pivotally mounted on the receiver for reciprocating between a retracted and a striking position. Also included are a bias spring, a trigger and a catch. The trigger is rotatably mounted on the receiver while the bias spring is attached to the hammer for urging it into a striking position. The catch is connected between the trigger and the hammer for releasably holding the hammer. The catch can retract the hammer in response to rotation of the trigger. The bolt carrier has a stop for engaging the hammer and holding the bolt carrier at its recoiled position. The catch is operable to release the bolt carrier from the stop by retracting the hammer.