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 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 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 firearm stock assembly having two substantially hollow stock shells enclosing the sides of the firearm assembly. The stock shells separate along parting lines on the top and bottom, for removal from the firearm. The forward ends of the stock shells engage studs on the firearm to retain the stock shells in place. The back end of each stock shell is removably secured to the buttplate of the firearm.

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 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 drum magazine particularly intended for feeding shotgun shells to a firearm such as an autoloading assault shotgun. The drum magazine includes a cartridge-carrying rotor having a pair of sprockets, and powered by a torsion spring disposed on a central post within the drum. A last-round cartridge follower, removably carried by the rotor, can move either to a radially-extended position to feed the last round from the drum, or to a position of reduced effective radius to accommodate the first round in the fully-loaded drum. The drum magazine is adaptable to shells of different lengths.

Abstract: A sling and pouch assembly for attachment to a carbine, without requiring existing sling swivels and without modifying the carbine. The sling assembly includes a front swivel having a hook which fits beneath the existing barrel band of the carbine. The rear swivel is attached to one side of a cuff which fits around the stock adjacent the butt plate. The cuff assembly includes one or more pouches for storing ammunition or the like. The cuff assembly has a skid-resistant inner surface for retention on the stock of the carbine.

Abstract: A portable lightweight rifle which is primarily intended for use as a survival rifle. The rifle is readily disassembled into two assemblies for storage or ease of transporting, without requiring any separable fastener. A supply of ammunition is carried in a hollow stack tube. Both a rimfire embodiment and a centerfire embodiment are disclosed, and stampings or other relatively inexpensive and lightweight components are extensively used in both embodiments.

Abstract: Apparatus for converting a firearm of a first caliber to fire cartridges of a second caliber. The regular bolt assembly of the firearm is removed and replaced with a conversion bolt assembly having a flat receiver plate which is bifurcated to provide a pair of flat rails. A bolt assembly is supported for movement along the rails, out of contact with the receiver of the firearm. The receiver plate of the conversion bolt assembly extends forwardly from a backplate which accurately locates the conversion assembly within the firearm, and the receiver plate is tilted to clear the conventional ejection port of the firearm. The conversion bolt assembly includes an automatic sear trip which enables full-automatic firing of second caliber cartridges on firearms that are so equipped, and also includes a weight for improved full-automatic operation. The disclosed embodiment is designed for use with an M-16 or AR-15 rifle.

Abstract: Apparatus for securing a doorknob against unauthorized entry. A shroud fits over the entire doorknob and its associated shaft, and extends to fit on or over the rose through which the shaft extends. A clevis fits through slots in the shroud to retain the shroud in place on the door knob and shaft. The present apparatus can be used to retrofit a lock onto an existing knob which has no locking structure, and also prevents tampering or unauthorized access to an existing built-in lock cylinder of a doorknob.

Abstract: A concealment holster which fits an article such as a firearm to be carried in complete concealment. The holster is provided by an elongated pouch having a rounded bottom and an open top, so as to contain a handgun in butt-inverted position. The pouch is detachably connected to the shirttail of a wearer so that the pouch and its contents are hidden behind and/or beneath the wearer's trousers waistband.

Abstract: Apparatus for converting a firearm of a first caliber to fire cartridges of a second caliber. The regular bolt assembly of the firearm is removed and replaced with a conversion bolt assembly having a flat receiver plate which is bifurcated to provide a pair of flat rails. A bolt assembly is supported for movement along the rails, out of contact with the receiver of the firearm. The receiver plate of the conversion bolt assembly extends forwardly from a backplate which accurately locates the conversion assembly within the firearm, and the receiver plate is tilted to clear the conventional ejection port of the firearm. The conversion bolt assembly includes an automatic sear trip which enables full-automatic firing of second caliber cartridges on firearms that are so equipped, and also includes a weight for improved full-automatic operation. The disclosed embodiment is designed for use with an M-16 or AR-15 rifle.

Abstract: Automatic bolt catch release apparatus for an open-bolt firearm of the type which includes a bolt catch to retain the fully-automatic bolt in open position upon firing the last round in a magazine. The bolt catch is released when the empty magazine is withdrawn from the firearm, so that the bolt can move forward into engagement with the sear to be maintained in a fireable open position. The firearm can then be fired as soon as a fresh magazine is provided.

Abstract: An open-bolt firing conversion for the standard M16 rifle, which allows the rifle to be converted to open-bolt firing by replacement of parts and without otherwise altering the rifle. The open-bolt conversion is hammer-fired for reliability and preservation of the cyclic firing rate, and the conversion hammer straddles the conversion sear within the conventional M16 lower receiver. The open-bolt converted rifle can fire either semiautomatic or full-automatic under control of the conventional firing selector lever.The cyclic rate reducer is installed in a conventional M16 rifle, without further modification to the rifle, to lower the automatic fire cyclic rate to approximately 350 rounds per minute. The cyclic rate reducer includes an actuator assembly which is received behind a modified bolt carrier, and which is released to move forward and contact an automatic sear release only after the bolt carrier has completed at least a substantial portion of its forward movement.

Abstract: A throwing knife having a multiple number of pointed blades for hitting a target, and being readily foldable so as to be carried conveniently when not in use. Each blade has a number of locking studs on one side of the blade, and a corresponding number of mating locking dimples on the other side of the blade. The blades are pivotally mounted on an axle about which the blades can be rotated either to the folded position with all blades stacked one above the other, or to the throwing position wherein the blades radiate outwardly from the axle. The studs and complementary dimples of adjacent blades engage one another in the folded and the throwing positions so as to secure the knife in such positions.

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 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.

Abstract: A ramp-type sight for a firearm such as a rifle. The sight has a fixed plane member defining a ramp, and a movable plane member which slides along the ramp and which carries a visual sighting member such as a peep sight. The movable member contains a number of contiguous openings which overlap one another along a linear path, and a member having a conical surface is resiliently urged into the contiguous openings, so that each opening provides a click-type elevation adjustment for the movable member.

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.

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.