Abstract: A conversion kit and method for converting the RUGER® 10/22® semi-automatic .22 caliber rim fire rifle to shoot .17 HM 2 cartridges utilizes the original bolt in the receiver and replaces the bolt operating handle with increased weight to replace the original bolt handle along with a .17 caliber barrel to permit the modified rifle to safely fire, eject and reload the .17 caliber cartridges.

Abstract: A module housing is adapted to be inserted into an operating position in the trigger group receiving area of a firearm. The module housing includes at least one pin receiver defined by two openings formed in the module housing, one on each lateral side of the housing. A module pin is received in the pin receiver and at least one trigger group component is mounted or supported for rotation on the module pin. The pin receiver is located on the module housing so as to align with a pin receptacle of the firearm when the module housing is in the operating position. By locating the pin receiver in the module housing so as to align with a corresponding pin receptacle of the firearm when the module housing is in the operating position, the trigger group module and the trigger group components housed in the module housing may be readily supported by the OEM pin receptacle.

Abstract: A blow-back operating automatic firearm has a sliding mass carried with its bolt carrier assembly to increase the dwell time of the bolt at the breech when the bolt is in battery position for firing. The sliding mass reduces the tendency of the bolt to bounce-off the head end of the seated cartridge, thereby reducing the risk that a misfiring will occur.

Abstract: The invention relates to a device for feeding cartridges (15) from magazines to small arms, in particular to rifles with a cartridge feed device (3-7, 25-29), which transports the cartridges from a tubular magazine (11) to the barrel (1) by means of a device, in particular a rocker/spoon (3, 25-29). Said device comprises a breech, which receives the cartridges from the cartridge feed device, slides them into the barrel and closes the latter. The rocker/spoon of the cartridge feed device can be removed from the intermediate chamber between the tubular magazine and the lock (13) and an interchangeable cartridge magazine (16) can be inserted in the empty intermediate chamber (21). In a first embodiment, the rocker (3) can be displaced from a front position into a rear position. In a second embodiment, the rocker (3) can be pivoted from an upper, approximately horizontal position into a lower, approximately perpendicular position.

Abstract: The present invention relates to an automatic bolt hold-open rotating assembly to convert a manual bolt hold-open function to an automatic bolt hold-open function in automatic and semi-automatic pistols and rifles, such as the Ruger 10/22 semi-automatic .22 caliber rifle. The components of the assembly readily replace standard factory components in the trigger assembly and replace the standard magazine. The assembly comprises a magazine with channel cutout, a bolt stop, a bolt stop handle for manual manipulation of the assembly, a bolt stop spring to apply clockwise pressure on assembly, a cartridge detecting lever which also serves as a cartridge ejector pivotably mounted on bolt stop with an extension which interfaces with channel cutout of magazine, a tab protruding from the ejector lever which rides in a slot on the bolt stop to limit pivoting of the cartridge detecting lever, and a lever spring allowing counter-clockwise pivoting of cartridge detecting lever to facilitate insertion of recharged magazine.

Abstract: An interchangeable upper receiver assembly for use with a hand held weapon and the interchangeable upper receiver assembly in combination with the hand held weapon, where the interchangeable upper receiver assembly includes an integral, unitary breech block and barrel that is operably removably couplable to the lower receiver assembly of the hand held weapon in an engaged disposition. A bolt assembly is slidably disposed within a bolt recess defined in the receiver breech block and barrel. The bolt includes a firing pin slidably disposed therein, the firing pin being selectively actuatable by the trigger assembly when the receiver is in the engaged disposition.

Abstract: A trigger arrangement for an automatic weapon with switch-over between continuous firing and single-shot modes includes a hammer, a breechblock, a latch, a pivotably mounted trigger, and a firing lever. In the single-shot mode, the firing lever engages the hammer and retains it in tension while the trigger is depressed. When the continuous firing mode is selected, the firing lever is moved to an inactive position and retained by an engaging element. The engaging element is preferably a slider which is controlled by a safety and firing cessation roller that is actuated by an operating lever.

Abstract: An improved non-tilt barrel for converting a conventional semi-automatic weapon from having a pivoting linkage between the barrel and the receiver to a weapon having a cam in order to reduce the recoil of the weapon and to increase the accuracy of the weapon. Further, the non-tilt barrel is provided for increasing the distance of travel of the barrel during recoil to, in turn, increase the time of lockup between the barrel and the slide during the firing of a cartridge. As a result of the modifications resulting in the non-tilt barrel, internal pressures are reduced during the unlocking of the barrel and slide, thereby accomplishing a longer life for each component, and especially the recoil buffer pad. The position of the slide stop on a conventional firearm is moved slightly up and toward the rear of the gun. The length of the slide stop lever is varied accordingly such that engagement with the slide stop plunger is maintained in conventional fashion.

Abstract: A firearm conversion system for firearms having a pivoted hammer. The conversion system utilizes a plurality of different mode determinating cams which may be alternately mounted upon a shaft, the shaft also supporting the pivoted hammer. The cams each provide a selection among firing modes including safe, fire, single-action and double-action.

Abstract: A fire selector system for selecting between automatic and semi-automatic operation of a gun is provided. The system is mountable on a reciprocating slide of the gun and into operative relationship with the trigger bar of the gun. A member of the selector system is movable between forward and rearward longitudinal positions. The forward longitudinal position allows the member to assume an activating longitudinal position for automatic operation of the gun. The rearward longitudinal position prevents the member from assuming its activating longitudinal position, thereby effecting semi-automatic operation of the gun. The member repetitively contacts a contact area of the trigger bar as it reciprocates with a reciprocating slide of the gun during automatic operation. Further, the device is easily installed and removed from the reciprocating slide depending on user requirements.

Abstract: An automatic pistol adapted to repetitively fire blank ammunition includes a frame, a barrel unit supported by the frame and a slide unit reciprocally mounted on the frame between the forward and rear position. The barrel unit and/or frame incorporate structure which enables the pistol to operate in a highly reliable, repetitive manner without visible alteration to the pistol. A method for forming a blank firing pistol is also disclosed.

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 striking mechanism (20) for the semi-automatic operation of a cartridge firing firearm (10) providing, in combination, a receiver (12); a barrel (11) attached to the receiver; a gas operated slide assembly (13) providing a slide (14) movable within the receiver; a magazine (19), supplying a plurality of cartridges (29), carried by the receiver; and a trigger assembly (26) attached to the receiver and providing a hammer (28); the striking mechanism comprising a bolt (21) reciprocable within the receiver and engageable with the breach (32) of the barrel and the face of a cartridge chambered therein, the bolt carrying a primary firing pin (22); a bolt lock (23) pivotally linked to the bolt for selectively locking the bolt within the receiver; a secondary firing pin assembly (24) pivotally linked to the bolt lock and to the slide, the secondary firing pin assembly providing a secondary firing pin (25), engageable with the hammer and the primary firing pin thereby to strike the primer of a cartridge chambered wi

Abstract: A pistol is disclosed which is selectable between automatic and semi-automatic operation. A device is provided which permits existing semiautomatic firearms to be converted so that they may be fired in either fully automatic or semiautomatic mode. A novel trigger bar and selector are disclosed.

Abstract: An automatic pistol adapted to repetitively fire blank ammunition includes a frame, a barrel unit supported by the frame and a slide unit reciprocally mounted on the frame between the forward and rear position. The barrel unit and/or frame incorporate structure which enables the pistol to operate in a highly reliable, repetitive manner without visible alteration to the pistol. A method for forming a blank firing pistol is also disclosed.

Abstract: A modified M16 pistol capable of firing rifle cartridges therein in automatic or semi-automatic mode, which pistol is based upon modified M16 upper and lower assemblies, with a pistol barrel, an M16 gas actuation system, and a spring-biased buffer system mounted on top of the M16 upper receiver assembly.

Abstract: An M16 type rifle is disclosed having a gas piston assembly with a relatively large piston area and sufficient stroke to actuate the M16 bolt carrier assembly in order to allow the M16 rifle to be chambered for short low-pressure pistol cartridges such as the 45 ACP, 10 mm, and 40 S&W. The gas piston assembly provides relatively constant contact between the piston rod and the gas carrier key of the conventional M16 bolt carrier assembly.

Abstract: In an automatic weapon system such as the AR-15/M-16, the passage of propellant gas-carried heat, powder residues, and dirt to the bolt carrier and the upper receiver of the weapon is eliminated. The standard recoil spring housed in the buttstock of the weapon can be eliminated to produce a weapon with a folding stock or a machine pistol. Propelling gasses drive a piston which in turn drives a piston rod which is integrally coupled with the carrier key of the weapon. There is no relative movement between the rod and the carrier key. Therefore, no impact is delivered by the rod to the carrier. Longer carrier life is assured. The original recoil spring can be eliminated by a recoil spring on the piston rod. The ability to vary the volume of the gas chamber in which the piston is driven permits control of the firing rate of the weapon. A further enhancement permits the total blockage of propellant gasses from the gas cylinder so that the weapon may only be fired in a single action, single shot mode.

Abstract: An improvement for a caliber conversion kit for semiautomatic and automatic firearms to allow the use of smaller caliber ammunition within. The conversion kit comprises the replacement of the bolt, barrel and magazine clip of the existing firearm so that the firing speed and thus the action or feel is similar to a standard nonmodified firearm having larger caliber ammunition.

Abstract: An improvement for a caliber conversion kit for semiautomatic and automatic firearms to allow the use of smaller caliber ammunition within. The conversion kit comprises the replacement of the bolt, barrel and magazine clip of the existing firearm so that the firing speed and thus the action or feel is similar to a standard nonmodified firearm having larger caliber ammunition.

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 Linkless-Ammunition Gun Transfer Unit is provided for the conversion of a linked-ammunition firing gun to a linkless-ammunition firing gun, which includes a drive train for engaging ammunition feed sprockets disposed in the existing ammunition feeder and coupling means for removably attaching a linkless-ammunition feed chute to the ammunition feeder assembly and aligning the ammunition feed sprockets in the ammunition feeder assembly with the ammunition transfer sprockets disposed in the feed chute. Power from the gun is utilized to operate the linkless-ammunition feed mechanism.

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 unit is disclosed for use in converting a blowback autoloading pistol, such as a U.S. caliber .45 model 1911, into a gas operated one with the unit being adapted for connection to the receiver of the blowback pistol after its barrel and slide are removed. The unit comprises a shroud, a barrel and a gas activated piston for operating the bolt and its lock. The hammer, constituting part of the firing mechanism carried by the receiver, cooperates with the firing pin of the conversion unit in the same way as it did with the firing pin of the autoloading pistol. Instead of being used to effect a conversion, the structure involved in the conversion unit can also be used in making a completely new gas operated pistol or other firearm.

Abstract: A reconversion device permits a rapid conversion from a semi-automatic operation system to a pump system and vice versa for fixed barrel sporting and defense guns without disassembling the gun.

Abstract: This invention is designed for the conversion of the Mini-14 and AC-556 family of firearms as manufactured by the Sturm Ruger and Co., Inc. in Southport, Conn., for firing of smaller, less powerful ammunition for which it was not originally designed, by providing a conversion bolt assembly, auxiliary chamber assembly, operating rod assembly and magazine. The invention may also be employed in other firearms of similar construction without departing from the intent and scope of this invention.

Abstract: The invention relates to a sound dampened automatic hand firearm provided with silencing means for the firing of projectiles at a muzzle velocity in the subsonic speed range. In order to reduce also the breechblock noise during shot release, in addition to the muzzle noise and the projectile boom, a locking lever (18) is provided for locking the closed breechblock during discharge of the weapon. Preferably, the locking lever (18) is pivotable about an axis (19) oriented transversely to the barrel axis (24) and is held out of engagement by a spring (20). Associated with the trigger system is a catch (15) which causes the locking lever (18) to be pivoted into the locking position as the trigger (6) is being pulled. The catch (15) is pivotably mounted on the trigger (6).

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 reversible front bolt for converting a firearm of a first caliber to fire cartridges of a second caliber; or to provide a second front bolt of the same caliber as a spare part. The regular bolt assembly comprises a front bolt, a plurality of rails and a rear bolt, wherein the rails connect, and rigidly position the front bolt with respect to the rear bolt. The front bolt has two firing faces, and to change from one firing face to the other, the rails are disconnected from the front bolt, the front bolt reversed and the rails reconnected to the front bolt.

Abstract: A shot-gun with gas take-off has a fore end stock which is movable longitudinally of the barrel and lockable selectively in each of two positions: in one position gases from the discharge of a cartridge in the gun bleed from the barrel into the chamber of a piston/cylinder unit to drive the piston to operate an arming rod of the shot gun automatically. In the other position, a valve member prevents the discharge gases from entering the cylinder chamber, these gases being vented to the external environment: the stock is rigidly locked to the piston for manual operation of the arming rod by "pump" action on the stock in the latter position.

Abstract: A rifle having a body comprised of hingedly interconnected lower and upper receivers, a trigger and hammer assembly mounted in the lower receiver, a barrel extending from one end of the upper receiver, an integrated bolt assembly removably mounted in the upper receiver, the bolt assembly comprising a bolt carrier slidably mounted on two action rods joined at corresponding first ends by an action plate, the action rods being releasably supported at corresponding ends in the rifle body, a bolt slidably mounted in the bolt carrier, a firing pin slidably mounted in the bolt, compression springs between the action plate and the bolt carrier and retaining means on the action rods to retain the bolt carrier on the action rods and retain the members of the bolt assembly integrated so the bolt assembly can be removed from the upper receiver as a complete unit.

Abstract: A conversion system for .30 caliber semi-automatic carbines permits selective use with .22 caliber ammunition. Modified barrel, bolt, operating slide and magazine sub-assemblies easily replace the corresponding original sub-assemblies to provide for direct blow-back operating slide actuation with .22 caliber ammunition. The replacement parts are of such simplified construction as permits manufacturing and sales as a conversion kit at a fraction of the original cost of the .30 caliber carbine to be converted. The conversion technique also provides for the independent manufacture of a unique .22 caliber semi-automatic carbine having the general appearance and "feel" of the standard .30 caliber M1 carbine.

Abstract: Automatic or semi-automatic sporting weapon of the type with gas tapping, characterized by the fact that it is fitted with a floating barrel.

Abstract: The invention provides a barrel locking device for automatic pistols, and a sub-caliber conversion therefor. The essential elements of the locking device are the barrel, the aligning cheeks at the rear end of the barrel, the barrel extension member, a link pivotally connected to such barrel extension member and having a hole therein, a slide-stop having a pivot pin for engagement in a transverse through hole in the piston receiver and in the hole in the link, and a barrel locking screw which engages in a threaded hole in the front face of the extension member. Upon tightening of the barrel locking screw the link is rotated forwardly and pulls the barrel and slide into intimate contact with the receiver by engagement of the barrel cheeks with the upper surface of the receiver.

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 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: A conversion kit for allowing an M16 rifle to fire .22 caliber ball and bk ammunition in semi-automatic and automatic firing modes, comprises a bolt replacement which replaces the standard bolt in the rifle. The bolt replacement moves in the rifle receiver and is engageable with a sear trip bar of the conversion kit. The sear trip bar interacts with an automatic sear of the M16 rifle to permit automatic fire. A spring loaded detent is provided in the conversion for engaging a detent slot in the replacement bolt, to hold the bolt face against a chamber insert, to avoid bouncing of the bolt for automatic and burst firing modes. For the firing of blank cartridges, a shaft is provided in a chamber insert for reducing the diameter of the chamber insert to preclude the feeding of ball cartridges. An orifice in the shaft allows for escaping gases to leave the blank cartridge, but produces back pressure so that the replacement bolt can be cycled for blow back operation.