Abstract: Fire control mechanisms for a firearm include a trigger disconnect assembly and an action lock mechanism which work together to ensure safe and reliable firearm operation. The trigger disconnect uses a spring biased disconnector pivotably mounted on the trigger to actuate the sear and release a hammer sear upon firing. The hammer sear engages a compliant interface formed by a spring which actuates the action lock to unlock the bolt after the trigger has been pulled.

Abstract: An ejector mechanism for a firearm includes an ejector disposed at a forward face of a bolt. The ejector includes a hole designed to provide clearance for the firing pin to pass at least partially through the ejector. The hole may include a counterbore on a rear side of the ejector.

Abstract: A screw and spring assembly for adjusting trigger pull force comprises (1) a trigger housing, (2) a trigger shoe that is inside of the trigger housing (typically sitting on a bushing that runs through the housing and the trigger shoe) (3) a spacer, (4) a trigger-shoe compression spring, (5) an adjustable screw, and (6) a pressed-fitted compression spring that “locks” the adjustable screw into place in various positions, wherein the pull force needed to pull the trigger is different at each of the various positions.

Abstract: forward closed breech position in battery with the barrel and rearward open breech position, a cockable hammer controlled by a trigger, and a bolt release mechanism operably interacting with the bolt. The mechanism may comprise a user-actuated release button and spring-biased disconnect lever coupled thereto and selectively engageable with the hammer. Upon firing, the bolt travels rearward under recoil contacting and partially rotating the disconnect lever to engage the hammer, while simultaneously engaging the hammer which holds the bolt rearward. Actuating the release button fully rotates the disconnect lever to disengage the hammer from the bolt which returns to its forward position via a recoil spring to reclose the breech. A dual interlock safety in one position provided by the release mechanism prevents pulling the trigger and in another position prevents actuating the release button.

Abstract: A trigger assembly for a firearm is disclosed wherein the firearm includes a receiver, a safety selector and a hammer. The trigger assembly includes a trigger having a pivot axis, a front hook which is constructed and arranged to move with trigger rotation, a rear hook which is cooperatively arranged with the front hook and a spring which is positioned between the front hook and the rear hook. The front hook and the trigger are constructed and arranged relative to the safety selector and relative to the hammer in order to allow the hammer to be recocked from an upright position with the safety selector in a “SAFE” position. This particular construction provides a trigger assembly which is constructed and arranged as a two-stage, drop-in trigger assembly which is compliant with the European Standard for an M4/M16 (AR) platform.

Abstract: A bi-directional trigger assembly comprises a trigger having a first protrusion. A trigger bar having a slot is coupled to the trigger. A selector switch is positioned adjacent the rear end of the trigger bar. A disconnector is accommodated within the slot. A hammer is provided adjacent the front end of the trigger bar, wherein the hammer is configured for operable coupling to the trigger bar and the disconnector. A linkage is configured for fitment adjacent the trigger bar within the fire arm, wherein the linkage includes a second protrusion positioned adjacent a top edge of the trigger bar. The linkage further includes a third protrusion wherein the third protrusion abuts the first protrusion for displacing the linkage downward when a forward force is applied on the trigger, thereby causing the second protrusion to exert a downward acting force adjacent the front end of the trigger bar.

Abstract: The invention relates to a device for prevention of the tensioning of a firing pin spring in the disarming of a hammerless self-loading pistol (1) provided with a lock slide (7), wherein the device can assume a disarming position and a locking position, with: a spring-loadable firing pin (17) with a lug (17a) formed on it for active engagement with a sear (19), which in the cocking position for cocking the firing pin spring protrudes into the path of motion of the lug (17a) and in the disarming position is disengaged from the lug (17a), a trigger bar (27) coupled with a trigger which in the disarming position disengages the sear (19) from the lug (17a), and is characterized by a disarming shaft (15), which in the disarming position enables a movement of the trigger (5) and thus the trigger bar (27) to the front, and a disconnector bar (21) that can be coupled to the trigger bar (27), said disconnector bar being impacted in the disarming position by the lock slide (7) moved to the front and as a result operati

Abstract: The pistol comprises a frame (1) containing a barrel (4) slidably mounted. The pistol further comprises a firing mechanism comprising a hammer (11) mounted so that it can pivot at the rear of the pistol, and a trigger (10) secured to an actuating arm (15) that acts on means (19) of arming the hammer (11) and retaining it in the armed position. The means for arming and retaining the hammer (11) comprise a link (19) directly connected to the hammer (11) by an articulation (20) and which is actuated via a lever (40) pivot-mounted in the frame (1). The lever has a top end actuated by the barrel as the latter moves into its forward position in order to cause the lever (40) to pivot, and a bottom end acting like a cam on the link (19) by pushing it backwards in order to rearm the hammer (11).

Abstract: An automatic or semi-automatic firearm including a trigger having a frame, at least one trigger sear extending from the frame, and a hammer having a hammer pivot axis, a head and at least one hammer sear disposed on a lateral side of the hammer between the hammer pivot axis and the head, wherein the frame includes a pivot axis and the at least one trigger sear includes a trigger sear surface, the at least one trigger sear extending from the frame such that the at least one trigger sear engages a corresponding one of the at least one hammer sear.

Abstract: An improved M1911 pistol, method of making an improved M1911 pistol, and system for improving performance of an M1911 pistol. Replacement parts for the M1911 pistol include stainless steel, which may be a 17-4Ph metal. Improved replacement parts include an improved frame and an improved slide.

Abstract: A fire control selector for an automatic firearm capable of automatic or semiautomatic fire is provided. The firearm has a receiver having a moveable hammer. The selector is rotatably mounted in the receiver. A first sear is rotatably mounted in the receiver to engage the hammer where the first sear contacts a first camming surface of the selector. A second sear is rotatably mounted in the receiver to engage the hammer where the second sear contacts a second camming surface of the selector. A disconnect is rotatably mounted in the receiver where the disconnect contacts a third camming surface of the selector. The selector has a number of selectable positions.

Abstract: One embodiment of a trigger system with an integral selector for semi-automatic firearms. A selector allows the user to choose between two modes and rates of fire. A trigger (1) is made to allow passage of the lower portion of a selector cam (5) to the exterior of the firearm. A selector lever (6) is affixed to the lower end of the selector cam (5) on the exterior of the firearms action. Turning the selector lever (6) rotates the selector cam (5) which tilts a pivotal disconnector (3) on its axis, varying the amount of disconnector (3) engagement with a hammer (2). The variance in the disconnector (3) engagement causes the firearm to fire in one of two modes, firing one round with a trigger pull and resetting with trigger release, or firing one round with trigger pull, and firing another round with trigger release. Other embodiments are described.

Abstract: One embodiment of a trigger system with an integral selector for semi-automatic firearms. A selector allows the user to choose between two modes and rates of fire. A trigger (1) is made to allow passage of the lower portion of a selector cam (5) to the exterior of the firearm. A selector lever (6) is affixed to the lower end of the selector cam (5) on the exterior of the firearms action. Turning the selector lever (6) rotates the selector cam (5) which tilts a pivotal disconnector (3) on its axis, varying the amount of disconnector (3) engagement with a hammer (2). The variance in the disconnector (3) engagement causes the firearm to fire in one of two modes, firing one round with a trigger pull and resetting with trigger release, or firing one round with trigger pull, and firing another round with trigger release. Other embodiments are described.

Abstract: An upper receiver is provided for cooperatively engaging a lower receiver, wherein the lower receiver includes at least a trigger and a lower hammer. The upper receiver includes an upper sear movable in response to movement of the lower hammer, thereby permitting an upper hammer in the upper receiver to actuate a valve in the upper receiver and pass a motive gas to a firing chamber and thereby expel a projectile through a barrel of the upper receiver.

Abstract: A dual stage trigger assembly for a firearm. The trigger assembly comprises a spring loaded lightweight hammer, a spring loaded trigger, a spring loaded disconnector, a spring follower for the disconnector spring and two adjustment screws that allow the user the ability to adjust the sear face of the trigger that is engaged with the hammer in the cocked position and adjust the force imparted to the disconnector by the disconnector spring.

Abstract: A reciprocating stock and interface system for a semi-automatic firearm. The interface system includes first and second bearing elements. A handle is provided with an integral finger rest. The finger rest is concave to form a cradle for the user's trigger finger. In use, the user grasps the handle with one hand and places an index finger of the same hand firmly on the finger rest. When intending to fire a round of ammunition, the user pushes the receiver forward with their other hand so that the trigger collides with the stabilized finger. Recoil force quickly separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock can be selectively engaged to restrict longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality.

Abstract: A firearm receiver with an extended bridge is created to prevent the fully automatic fire of an assault rifle. The extended bridge receiver has a narrowed magazine well for a single stack removable magazine, safety catch with one or more grooves on its lower left hand side, new sporting stock where grip part and butt-stock part form one unit and barrel extension permanently attached to the muzzle. The receiver can be configured with a rivet on the bridge in a location that prevents backward turning of the safety catch, where the modified safety catch has two positions (i.e. safe and fire), rather than the three positions consistent with a fully automatic firearm. In a second version, the extended bridge lacks a release lever groove. In yet another version, an inseparable, double stack magazine box is used.

Abstract: A trigger assembly for a trigger housing for an M240 Assault Rifle is provided having a switch accessible at the outside of the trigger housing for changing the firing of the rifle between semi-automatic and fully-automatic fire.

Abstract: A dual stage trigger assembly for a firearm. The trigger assembly comprises a spring loaded lightweight hammer, a spring loaded trigger, a spring loaded disconnector, a spring follower for the disconnector spring and two adjustment screws that allow the user the ability to adjust the sear face of the trigger that is engaged with the hammer in the cocked position and adjust the force imparted to the disconnector by the disconnector spring.

Abstract: An automatic firearm capable of automatic or semiautomatic fire. The firearm has a receiver having a moveable hammer. A selector is rotatably mounted in the receiver. A first sear is rotatably mounted in the receiver to engage the hammer where the first sear contacts a first camming surface of the selector. A second sear is rotatably mounted in the receiver to engage the hammer where the second sear contacts a second camming surface of the selector. A disconnect is rotatably mounted in the receiver where the disconnect contacts a third camming surface of the selector. The selector has a number of selectable positions disposed so that rotation of the selector between a first and last selectable position of the number of selectable positions is less than 180 degrees.

Abstract: A striking mechanism for the semi-automatic operation of a cartridge firing firearm includes a receiver, a barrel attached to the receiver and providing a breach, an op rod assembly, and a bolt adapted for reciprocating movement within the receiver and engagable with the breach of the barrel and the face of a cartridge chambered therein. The bolt carries a primary firing pin, and a bolt lock means is pivotally connected to the bolt for selectively locking the bolt within the receiver. A bolt link assembly is pivotally connected to the bolt lock means and to the op rod assembly. The bolt link assembly provides a bolt link transfer pin. An op rod transfer pin is carried by the op rod assembly and can engage the bolt link transfer pin.

Abstract: A semi-automatic pistol is created by the modification of a fully automatic sub-machine gun Sa vz. 61. The semi-automatic pistol is constructed partly from original parts of the Sa vz. 61 sub-machine gun, i.e. barrel, receiver, trigger, trigger lever and pistol grip, partly from modified parts of Sa vz. 61 sub-machine gun, i.e. hammer, interrupter and bolt, and partly from newly manufactured parts, i.e. semi-automatic frame without a groove in the bridge for the release lever and openings in rear stop for retarder assembly and without rails for folding stock on the outside of the rear wall, and a new safety lever with holes and grooves in such a positions that only semi-automatic fire is possible in its forward position. Some parts of the Sa vz. 61 sub-machine gun are removed completely, i.e. original frame, original safety lever, release lever, folding stock and retarder group (bolt hook, weight, counterweight, spring).

Abstract: The current invention is an improvement upon the M1 Garand semiautomatic rifle U.S. Pat. No. 1,892,141, and is related to the sighting and feed mechanism of that rifle. The M1 Garand semiautomatic rifle U.S. Pat. No. 1,892,141 has a problem with only being able to be loaded with an enbloc clip and not being able to mount a center line optical sight or other devices over the receiver of the rifle. The invention solves this problem by producing a trigger housing assembly, box magazine assembly, op-rod spring guide, operating rod catch and spring, and scope mount/rail as a unified system or kit for the rifle, that all function on the rifle without permanent alteration of the existing receiver or barrel.

Abstract: A semi-automatic firing carbine anti-jamming cartridge loading system is provided wherein no feed lips or a portion of said feed lips are removed, wherein the cartridge to be loaded is feed to the carbine breach along a feed ramp. A bolt enclosing the firing pin includes a pivot plate mounted on the bolt nose, rotating about an axle. A recess formed in the bolt nose provides spacing for the pivot plate to rotate about said axle. If the firing pin protrudes through an aperture formed in the pivot plate, while the pivot plate is still in its collapsed state, then the weapon will jam by the firing pin hanging on the top part of a rim portion of the next loading round, thereby thwarting attempts at reconfiguring the weapon, that employs my novel system, to be re-converted as a fully-automatic weapon.

Abstract: An automatic firearm capable of automatic or semiautomatic fire. The firearm has a receiver having a moveable hammer. A selector is rotatably mounted in the receiver. A first sear is rotatably mounted in the receiver to engage the hammer where the first sear contacts a first camming surface of the selector. A second sear is rotatably mounted in the receiver to engage the hammer where the second sear contacts a second camming surface of the selector. A disconnect is rotatably mounted in the receiver where the disconnect contacts a third camming surface of the selector. The selector has a number of selectable positions disposed so that rotation of the selector between a first and last selectable position of the number of selectable positions is less than 180 degrees.

Abstract: A two-stage trigger assembly for the M16 or AR15 weapon systems. The trigger assembly comprises a spring loaded hammer, trigger and disconnector. Calibrated springs are provided to facilitate the adjustment of the second stage trigger pull weight. No set screws adjustments are necessary and a secondary safety sear similar to the factory original fire control components has been incorporated to prevent the unintentional mechanical discharge of the firearm. Installation of the disclosed device is identical to the factory fire control group and requires no hand fitting.

Abstract: A fire control mechanism provides semi-automatic, burst, fully automatic, and safe modes for a firearm. The fire control mechanism includes first, second and third shafts. A hammer is rotatably mounted on the first shaft and biased for rotation about the first shaft in a first direction. An auto sear is mounted on the second shaft and engageable with the hammer. A semi disconnect is mounted on the second shaft and engageable with the hammer. A primary sear is mounted on the third shaft and engageable with the hammer.

Abstract: A closed bolt system with a trigger assembly for converting an open bolt, blowback type submachine gun into a single firing carbine is provided. The closed bolt system with trigger assembly includes a tensioned trigger member supporting a tensioned disconnector system. A tensioned sear interacts with the disconnector system and a tensioned hammer. The hammer strikes a firing pin in the bolt when it is released from the sear. The blowback of the bolt, as a result of expanding gases from the exploding and exiting round, re-cocks the hammer by re-engaging the sear with the hammer and disengages the sear from the disconnector system. Only after releasing the trigger will the sear re-engage with the disconnector system and thereby permit another round to be fired. A receiver having a cavity encloses the bolt and prohibits a fully automatic bolt to be used therewith.

Abstract: A semi-automatic sporting rifle is created by the modification of a fully automatic assault rifle Sa vz. 58. The semi-automatic rifle is constructed partly from original parts of the Sa vz. 58 assault rifle, i.e. bolt carrier, locking piece, striker, return mechanism, barrel, trigger, interrupter and left hand side striker catch, partly from modified parts of Sa vz. 58 assault rifle, i.e. bolt, trigger mechanism feather and safety catch and partly from newly manufactured parts, i.e. semi-automatic receiver with a narrowed magazine well for a single stack removable magazine with extended bridge, safety catch with one more groove on its lower left hand side, new sporting stock where grip part and butt-stock part form one unit and barrel extension permanently attached to the muzzle. Some parts of the Sa vz. 58 assault rifle are removed completely, i.e. muzzle thread protector, bayonet lug, original receiver, original stock, pistol grip, release lever, trigger lever and right hand side striker catch.

Abstract: A semi-automatic sporting rifle is created by the modification of a fully automatic assault rifle Sa vz. 58. The semi-automatic rifle is constructed partly from original parts of the Sa vz. 58 assault rifle, i.e. bolt carrier, locking piece, striker, return mechanism, barrel, trigger, interrupter and left hand side striker catch, partly from modified parts of Sa vz. 58 assault rifle, i.e. bolt, trigger mechanism feather and safety catch and partly from newly manufactured parts, i.e. semi-automatic receiver with a narrowed magazine well for a single stack removable magazine with extended bridge, safety catch with one more groove on its lower left hand side, new sporting stock where grip part and butt-stock part form one unit and barrel extension permanently attached to the muzzle. Some parts of the Sa vz. 58 assault rifle are removed completely, i.e. muzzle thread protector, bayonet lug, original receiver, original stock, pistol grip, release lever, trigger lever and right hand side striker catch.

Abstract: A semi-automatic sporting rifle is created by the modification of a fully automatic assault rifle Sa vz. 58. The semi-automatic rifle is constructed partly from original parts of the Sa vz. 58 assault rifle, i.e. bolt carrier, locking piece, striker, return mechanism, barrel, trigger, interrupter and left hand side striker catch, partly from modified parts of Sa vz. 58 assault rifle, i.e. bolt, trigger mechanism feather and safety catch and partly from newly manufactured parts, i.e. semi-automatic receiver with a narrowed magazine well for a single stack removable magazine with extended bridge, safety catch with one more groove on its lower left hand side, new sporting stock where grip part and butt-stock part form one unit and barrel extension permanently attached to the muzzle. Some parts of the Sa vz. 58 assault rifle are removed completely, i.e. muzzle thread protector, bayonet lug, original receiver, original stock, pistol grip, release, lever, trigger lever and right hand side striker catch.

Abstract: A dual stage trigger assembly for a firearm. The trigger assembly comprises a spring loaded lightweight hammer, a spring loaded trigger, a spring loaded disconnector, a spring follower for the disconnector spring and two adjustment screws that allow the user the ability to adjust the sear face of the trigger that is engaged with the hammer in the cocked position and adjust the force imparted to the disconnector by the disconnector spring.

Abstract: A closed bolt system with a trigger assembly for converting an open bolt, blowback type submachine gun into a single firing carbine is provided. The closed bolt system with trigger assembly includes a tensioned trigger member supporting a tensioned disconnector system. A tensioned sear interacts with the disconnector system and a tensioned hammer. The hammer strikes a firing pin in the bolt when it is released from the sear. The blowback of the bolt, as a result of expanding gases from the exploding and exiting round, re-cocks the hammer by re-engaging the sear with the hammer and disengages the sear from the disconnector system. Only after releasing the trigger will the sear re-engage with the disconnector system and thereby permit another round to be fired. A receiver having a cavity encloses the bolt and prohibits a fully automatic bolt to be used therewith.

Abstract: Devices and methods of converting semi-automatic firearms to a double-fire mode where a firearm fires a shot upon a single pull of a trigger, and fires a second shot upon a release of the trigger. A clip attachment can be constructed from a single component shaped to fit and mount onto the trigger and extend to protrude between and separate the foot of the safety-sear from the top of the trigger plate affecting the distance between the hammer engaging notch of the safety-sear and the hammer engaging notch of the trigger-sear which allows the firearm to discharge upon release of the trigger. Another version has a spacer pre-built onto a bottom portion of the pivotal safety sear.

Abstract: An adjustable trigger assembly adapted for installation into the carrier of an AK-47 and similar rifles. The assembly features a plurality of adjusting screws to adjust the force required for trigger pull, the over travel of the trigger after firing, and the forward rotational force and angle of a disconnector rotationally engaged in a slot in the trigger to thereby allow for adjustment of the force required during both stages of pull of a two stage trigger to fire the weapon. The device is adapted for engagement with the receiver of a conventional AK-47 in replacement of the original trigger mechanism and may be used with the original hammer or optionally may employ a replacement hammer which features limited contact with the trigger assembly to lessen the trigger pull required for firing.

Abstract: A semi-automatic handgun is disclosed including a frame having a barrel housing mounted thereon. A barrel is movably mounted on the barrel housing and has a cartridge chamber at its rearward end for receiving a cartridge therein. The barrel is movable between a rearward position and a forward position with respect to the barrel housing and is normally in its rearward position. The barrel moves forwardly in a straight line from its rearward position upon firing of the cartridge in the chamber to counteract the rearward energy of discharge, thereby reducing recoil. The handgun may be fired in either a single action or double action manner. The firing hammer of the handgun is re-cocked, upon firing of the cartridge, by means of a movable piston having a firing pin positioned therein with the firing pin engaging the hammer to move the hammer to its re-cocked position.

Abstract: A dual stage trigger assembly including a spring loaded hammer, a spring loaded trigger, a disconnect lever, a torsion spring adjustment plate, springs, and user available adjustment screws whereby a sear face of the trigger fully engages a notch in the hammer in cocked position; whereby a user available adjustment screw, without disturbing the assembly, allows a user to adjust a screw in a first end of the disconnect lever to adjust second stage trigger travel to set the length of engagement of the trigger sear with the hammer notch. At this point a contact face of the disconnect lever contacts a tang on the hammer and a user available adjustment screw in a second end of the disconnect lever compressing a spring held in the trigger adjusts trigger pressure needed to complete the second stage trigger pull after the contact face on the disconnect lever contacts the hammer tang.

Abstract: The M60 semi-automatic rifle (SAR) is a near clone of the U.S. military M60 machinegun, except the rifle is a modified version of the military gun. The M60 semi-automatic rifle differs functionally because it fires a single round with each pull of the trigger and fires with a closed bolt as opposed to multiple rounds fired with each pull of the trigger and firing from an open bolt of the M60 machinegun. Unique to the M60 SAR is a sear and interupter that travels with the bolt and is readily removable as an assembly, a firing pin that will indent the primer without operating rod assistance, and a design that has the Bureau of Alcohol Tobacco and Firearms approval for sale to Class 1 licensed dealers. The M60 semi-automatic rifle allows the military arms collector to have a functional near clone of the military machinegun without the expense and nuisance of registering a fully automatic machinegun.

Abstract: A multi-stage trigger assembly for use by a shooter of a firearm. Specifically an AR-15 or M-16 although other types of firearms could be used. The invention comprises a trigger, a disconnector, disconnector spring, and a hammer. The trigger and the hammer each include a respective engagement means for engaging each other so that the hammer is held in a cocked position by the trigger before the trigger is pulled. The hammer further includes a contact means for contacting the disconnector so that when the trigger is first pulled (the first stage) the contact means contacts the disconnector at a predetermined time and increases the pressure required to pull the trigger completely and disengage the engagement means of the hammer and the trigger (the second stage). Additionally, the disconnector is spring loaded by the disconnector spring and pivotally connected to the trigger.

Abstract: A trigger assembly for a gun comprises a trigger, a hammer mounted adjacent the trigger, a spring-biased member urging the hammer into a firing position, a sear on the trigger to hold the hammer in a cocked position, an auxiliary sear mounted on the trigger to engage the hammer in event the hammer is urged into a cocked position before the trigger is released, an adjustable spring-biased member attached to the auxiliary sear to permit adjustment of the auxiliary sear, and an adjustable elongated spring-biased component positioned longitudinally adjacent a lower portion of the trigger assembly and having one end impinging a front lower face of the trigger to permit fine adjustment of trigger movement. The adjustable spring-biased member attached to the auxiliary sear includes a hook member removably positioned upon the auxiliary sear, a threaded adapter positioned in the lower portion of the trigger assembly, and a spring connecting the hook member to the threaded adapter.

Abstract: A firearm (10) adapted for blowback operation has a receiver incorporating a longitudinally reciprocatable bolt assembly (24) having an inertia firing pin (40) which is movable between retracted or recoil and battery positions in the receiver (14). A trigger (68), including a sear (72), is pivotally mounted in the receiver. A hammer (74) is pivotally mounted in the receiver in such a manner that movement of the bolt assembly from the battery position to the recoil position urges the hammer into a cocked position. The hammer includes a first sear abutment (82) to engage the sear on the trigger, a second sear abutment (84) and a stop abutment (86). A disconnector (76) is pivotally mounted on the trigger pin (70). The disconnector includes a hook sear abutment (88) on an intermediate portion which is adapted to engage the second sear abutment on the hammer when the trigger is in a depressed position.

Abstract: A semiautomatic firing mechanism for an autoloading firearm. A generally C-shaped hammer is pivotably mounted behind a bolt, with a transversely-extending sear piece located below the rearwardly-facing open side of the hammer. The open ends of the hammer provide ledges selectively engageable with primary and secondary sear surfaces on the sear piece.

Abstract: A semi-automatic sporting rifle, firing high powered center fire cartridges, is easily and quickly convertible to a 22 rimfire rifle without loss of feel or balance. The dual purpose rifle features a short stroke, gas operating system which is rendered inactive when the rifle is converted to 22 rimfire action. In the conversion, a locking bolt assembly and magazine for high powered ammunition are replaced by a non-locking bolt and a combined cartridge adapter and magazine holder for 22 calibre rimfire ammunition. The principal components of the firearm, including barrel, receiver, firing mechanism, action spring, magazine latch, bolt connecting link, charging handle, sights, stock and forearm, are common to both forms of the rifle. The conversion may be accomplished by using only a pointed object, such as a bullet point or ball point pen.

Abstract: Firearm apparatus embodied in a semi-automatic, blowback operated rifle. The firearm includes a receiver made of two plates spaced apart to receive a bolt mechanism including a bolt mounted for reciprocal motion within a channel-shaped member; the operating spring for the bolt assembly is received in a slot within the bolt and is retained in place by the channel-shaped member. A unitary firing pin/extractor carried by the bolt functions as a firing pin and also provides multiple extractor functions. A simplified firing mechanism includes a hammer positioned to the rear of a cartridge magazine and operatively connected by a three-finger sear bar to a trigger mounted in front of the magazine. A safety mechanism is provided in conjunction with the trigger guard. Numerous components of this firearm apparatus provide multiple functions contributing to the economy and efficiency of the present firearm apparatus.