Abstract: A clamp and wedge attachment to fixed and moving components frictionally ages the components which become disengageable upon application of overriding forces. The wedge has an enlarged detachable loading end which fits between two tines of the clamp which acts as flexure springs. This structure eliminates the slide bounce problem encountered in adapting the M39, 20MM Automatic Revolver Cannon to a constant recoil mode of operation.

Abstract: An anti-kick or anti-recoil buffer device is provided for blowback breech block weapons and particularly for automatic repeating weapons such as automatic pistols. A weapon which is provided with the device of the invention includes a casing with a breech block displaceable thereon, and with an arrangement provided for the stoppage of the movable breech block at the end of its rearward stroke. The arrangement includes a restoring spring and a movable part whose mass is added to that of the breech block into the force of the restoring spring in order to check the movement of the breech block and produce progressive stoppage thereof.

Abstract: A lightweight one man portable automatic gas-operated weapon system for intry use having symmetrical forces applied to recoiling parts by use of two parallel gas pressure actuated rods acting in unison. An integral sprocket feed system is actuated by the recoiling parts and avoids gross asymmetrical force movements about the weapon's center of gravity resulting from shifting ammunition weight. A dual tube receiver and dual gas system is featured in the weapon. Major weapon subassemblies comprising modules are operatively interrelated to facilitate replacement during field use of the weapon.

Abstract: In an autoloading firearm, reloading is actuated by firing gases which are tapped from near the muzzle end of the barrel into a tubular magazine secured below the barrel. A reciprocating piston located inside the magazine is connected to a reloading mechanism and is driven to actuate the mechanism by the tapped gases. A cylindrical obturator is oppositely driven by the gases to scrape the interior of the magazine and serves as a valve to vent the gases.

Abstract: A firearm wherein a damper spring is positioned intermediate of a housing and a slide, associated with a return spring for the slide, one end of the damper spring bearing against the housing and the other end cooperating with the slide through an intermediate part. This part is maintained in permanent resilient contact with the housing in a direction transverse to that of the motion of the slide, and is movable relative to the housing jointly with the slide.

Abstract: A self-loading small arm which comprises a movable assembly and a buffer device for taking up the recoil energy of the movable assembly. The buffer device includes a spring whose compression is assured via a step-down lever at the end of the recoil stroke of the movable assembly.

Abstract: A recoil assembly for an automatic firearm, including a reciprocating bolt and carrier assembly, has a hydraulic buffer to provide a reduced rate of fire and prevent wide fluctuation in the round to round rate of fire. The buffer includes a piston which pushes hydraulic fluid through an orifice when depressed by the bolt and carrier assembly at the end of its recoil stroke. When the bolt and carrier assembly begins to displace the piston, hydraulic retardation is immediate. A spring loaded sliding seal pushes the hydraulic fluid through the orifice during the return stroke which returns the piston to its original extended position. The buffer also prevents carrier bounce and promotes a mild recoil shock.