Abstract: A foldable gun, useful in mob control and police undercover work because of small size and unassuming appearance when it is in folded configuration, includes a magazine housing and stock pivotally mounted to a receiver assembly in a manner in which the magazine housing may be pivoted to a parallel position adjacent a receiver assembly underside while containing a magazine. Pivotal mounting of the stock enables the stock to fold to an underside of the receiver assembly. A U-shaped configuration of the stock enables it to both contain and conceal the magazine housing and magazine when the gun is in the folded configuration. In this manner, an extremely compact folded gun is achieved, and further, the gun, when folded, does not resemble a weapon.

Abstract: The firing mechanism for an automatic firing weapon comprises a catch pawl or detent by means of which a to-and-fro moving weapon breechblock can be retained in its rear or rearmost position. To prevent damage to the breechblock or the catch pawl it is necessary, upon impact of the breechblock against the catch pawl, for such catch pawl to have been completely pivoted into the path of travel of the breechblock. The release of the catch pawl, which can be pivoted by the action of a spring into the path of travel of the breechblock, is accomplished by a feeler lever. This feeler lever fixedly retains the catch pawl in its breechblock release position by means of a firing or trigger lever. The feeler lever is retained, on the one hand, by a control or cam surface of the breechblock and, on the other hand, by a stop lever in its locking position in which it holds the firing lever in a position preventing the catch pawl from engaging with the breechblock.

Abstract: A gun having a trigger mechanism comprising a pivotally mounted trigger (73) which is connected to rotate a pivotal sear and a reciprocal bolt carrier assembly having lugs (325) which are arranged to engage with the rear of the sear and a notch (717) in the top of the sear. Mounted on the pivotal axis of the trigger is a prop member (745) which is arranged to cooperate with an L-shaped nose (720) of the sear so that when the trigger is pulled to rotate the sear in a first direction out of engagement with the lugs (325) the prop member (745) is initially prevented from moving with the trigger by the nose (720) and when the lugs are released by the sear the sear is further rotated in the first direction by the lugs contacting the upper sear surface to free the member to move toward the trigger and under the nose (720). The prop member is then positioned under the nose (720) and thereby prevents the sear from rotating in a direction counter to said first direction until the trigger is released.

Abstract: An assault rifle is converted from an original to a modified configuration having a remote trigger located forwardly of the magazine by mounting a remote forward trigger to the original rifle by means of a pair of shroud pieces which cradle the rifle's receiver, replacing the original removable trigger of the assault rifle with a replacement lever, providing a cam element movable within cam guides defined in the shroud pieces and connecting the cam element to the remote forward trigger so as to move the cam into engagement with the replacement lever upon actuation of the remote forward trigger. The parts required for conversion are readily detachable from the rifle to thereby return the weapon to its original configuration.

Abstract: A trigger device for an automatic firearm having a linear action breech block. The device includes a catch lever movable to arrest movement of the breech block and a specially constructed kinematic chain which prevents the occurrence of an ambiguous intermediate position of the catch lever which could allow the breech block to damage the catch lever and/or linkage elements connected thereto.

Abstract: The submachine gun also has a forward housing. The forward housing is installed over the forward bolt and barrel, and rotatably secured to the assembly collar, and to the barrel by a sling swivel and a muzzle nut. The forward housing has integrally made there with a pistol grip and trigger housing. The trigger housing contains the trigger mechanism and sear, said sear when the submachine gun is assembled engages selectively the plurality of ring grooves around the forward bolt. Externally attached and mounted to the front housing is a sight bridge. Thus assembled, the front housing with pistol grip and sight bridge may be fully rotated 360.degree. with respect to the stock, magazine, and ejector port while the sear continously engages the ring grooves of the front bolt, and the weapon is ready to fire and fully operable at any point of the 360.degree. rotation.

Abstract: An open-framework receiver automatic cannon comprises a cannon barrel and a breech ring mounting the barrel and through opposite sides of which intermediate regions of first and second elongate rigid tubular support members are received, with longitudinal axes thereof parallel to, equally spaced to sides of, and coplanar with, a barrel bore axis. Forward and rearward ends of the support members are respectively interconnected by a barrel support and a detachable recoil buffer which includes a bolt sear. Reciprocating movement of a bolt and a bolt carrier assembly is guided by longitudinal slots in the support members and a plate mounted between the buffer and breech ring. Disposed in the support members are means for driving the bolt assembly forwardly on unsearing; apparatus for causing recoil of the bolt carrier after firing to enable bolt unlocking and inertia means for reducing bolt carrier bounce from the breech ring on forward impact.

Abstract: A firing pin for a firearm, more particularly for a firearm provided with a gas-operated bolt and bolt-carrier, the firing pin being disposed slidably in a longitudinal bore in the bolt. The firing pin of the invention has its shoulder abutment, which limits the stroke of the firing pin, provided with longitudinal apertures, such as slots or holes, preferably disposed at an angle to the longitudinal axis of the firing pin, which provide passageways for the pressure gas operating the bolt-carrier and leaking along the stem of the firing pin. Carbon, or other dirt, is thus prevented from being deposited on the firing pin stem, more particularly at the shoulder abutment.

Abstract: An automatic gun for firing a projectile by means of a separately loaded pellant case has a receiving frame in which an elongated barrel can reciprocate. The barrel, which has an axial bore from its breech to its muzzle, has a chamber member slidably mounted on its breech end. This chamber member, having a concavity shaped to hold the propellant case, is transversely displaced from alignment with the barrel to an unlocked position by an actuating means, in response to barrel recoil.

Abstract: An improved servo-release mechanism for an automatic firearm. The reciprocally movable breech body coacts with the first arm of a rockable catch lever to hold the breech body in a predetermined position. An adjusting member is slidably movably mounted parallel to the direction of movement of the breech body. A kinetic energy absorption device forms part of the servo-release mechanism. The kinetic energy absorption device has a pair of members having mating contact surfaces which, when matingly contacting each other, effect a torque transfer. A pair of coil springs are respectively axially mounted on the pair of members. One of the members coacts with the reciprocating breech body and the other coacts with the adjusting member which in turn coacts with the first and a second arm of the catch lever. By selectively releasing the energy absorption device the automatic firearm can be singly or continuously fired.

Abstract: A semi-automatic firearm having a slide axially movable with respect to a frame between a forward battery position where the firearm is discharged, and a full recoil position where the spent cartridge is extracted and a new cartridge is subsequently loading. Either a pair of oppositely wound, concentric springs or a flat helical spring extends between the slide and the frame to form a recoil mechanism which resiliently biases the slide toward battery. The slide partially surrounds a barrel which is pivotally secured to the frame toward its rear end through a link. The slide contacts the barrel at a point diametrically spaced from the link when the slide is in battery thereby resiliently biasing the barrel in a forward direction which imparts a rotational moment to the barrel about the pivot axis of the link. The rotational moment forces the front end of the barrel downwardly against two distinct support areas on the slide.

Abstract: A firing chamber lock and unlock mechanism for automatic large caliber wens having a reciprocable firing chamber and rotatable cam means for both actuation of the locking and unlocking functions and actuation of the reciprocation of the firing chamber synchronized to the firing cycle requirements of the weapon system.

Abstract: An automatic weapon incorporating a retarded blow back, a cartridge and bolt centering assembly, light weight and minimum component construction, simplicity in disassembly, easily detachable barrel, unique belted ammunition feed system, disposable ammunition box, a guide buffering assembly, muzzle brake, remote firing capability, front sight charging system and a bulkhead recoil absorbing arrangement.

Abstract: An automatic weapon with a receiver, a breech block fixedly mounted in the receiver, a barrel reciprocable within the receiver, a spring biasing the barrel, and a gas cylinder chamber externally of the barrel and in communication therewith, whereby upon firing of the weapon, the gases discharged from a cartridge ejected from the barrel, pass into the gas cylinder chamber means to thereby tension the spring.

Abstract: An automatic pistol with blowback action, in which a hammer is cocked by the recoil of a slidable breechblock, has a retaining member in the form of an elongate lid detachably secured to the gunstock for holding the breechblock in place, this lid carrying a backstop for a restoring spring tending to thrust the breechblock forwardly. The rear limiting position of the breechblock is defined by a pair of upstanding wings, rigid with the gunstock, against which two lateral shoulders of the breechblock come to rest upon manual arming or after the firing of a cartridge. A swingable control element on the breechblock, entrainable by a setting knob through a lost-motion coupling, has a blocking position in which it prevents the hammer from striking a firing pin lodged in the breechblock; in a working position, this element is movably interposed between the hammer and the firing pin to act as a force-transmitting device upon the release of the hammer by depression of the trigger.