Abstract: An ejector system for the extraction of cartridge casings from a tubular weapon provided with two ejector levers that are pivotal about an axis. Prior art ejector systems of this type have the drawback in that the ejector claws which pull the cartridge casing out of the cartridge chamber after firing are fastened directly to the ejector levers so that, due to the circular arc movement of the ejector claws, the cartridge casings are ejected in an undefined direction of flight from round to round. However, large caliber weapons, particularly those equipped with automatic loading mechanism, require a defined ejection path of the cartridge casings. To avoid the above drawbacks, the disclosed ejector system fastens each ejector claw to an ejector that is linearly displaceable parallel to the longitudinal axis of the gun barrel.

Abstract: A ram head for possibly two-part ammunition which is provided at its bottom with a central rotationally symmetrical form-locking zone. In order to be able to unload the ammunition, a housing (1) is provided with a ring (11) that is arranged to be axially displaceable therein and is provided with a plurality of radially pivotally articulated extraction levers (12), with the extraction levers (12) being spreadable against a spring bias by a plunger (25). The ring is coupled with a slide sleeve (22) that is provided with a centering ring (23) having a shape corresponding to the form locking zone of the ammunition and the axial movement of the ring (11) and of the plunger (25) is controllable by an eccentric shaft (8) mounted on the housing.

Abstract: An ejector mounting arrangement in a pistol frame cavity readily disassembled in which a pivot pin unit includes spring loaded detents engageable in holes in the cavity walls. The holes communicate with the exterior of the pistol so the detents can be pushed into the cavity to allow the ejector and pin unit to drop out. The ejector may also hold the hammer pin in place.

Abstract: A multi-caliber firearm includes a breech, a pull-out claw at least partially disposed within the breech, and an adapter piece which is adjustably attached to the breech and onto which is formed a bearing surface which is located radially opposite the pull-out claw. The pull-out claw is capable of selectively engaging a cartridge case having a cartridge base. The position of the adapter piece is adjustable to enable the breech to accommodate cartridge cases having different cartridge base diameters. The adjustment of the adapter piece may be performed via rotation of an adapter piece formed with a plurality of steps ascending in a circumferential direction of the adapter piece, of via rotating an adapter piece which is screwed into the threaded bore and which moves radially with rotation of the adapter piece.

Abstract: A safety stop for small arms having a slide, which keeps a catastrophic fure of the slide from causing shooter injury is disclosed. An improvement in the ejector and slide permit them to function together as a safety stop to prevent a broken slide from continuing off the back of the receiver in the event of catastrophic failure of the slide. A widened section on the ejector is accommodated in the ejector slot of the slide during normal firing of the weapon. An internal shoulder fixed relative to the slide and projecting into the ejector slot near the front of the slot is provided. Upon catastrophic slide failure during firing, the rear portion of the slide travels beyond its normally most rearward position and the internal shoulder engages the widened section of the ejector, stopping the rearward motion of the slide and precluding injury to the shooter.

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 automatic firearm of especially simple construction and easy maintainability, having an adjustable cyclic firing rate. The firearm has a receiver with an upper and lower portion. The upper portion defines a cavity in which a bolt assembly reciprocates. The reciprocation is maintained by a single compression spring in the cavity, and the length of the cavity, and compression of the spring, are adjustable to vary the cyclic firing rate. The firearm includes an especially simple trigger group arrangement. The lower receiver portion is structured to protect the trigger group. Also disclosed is an especially simple, yet practical ejector mechanism.

Abstract: A variable caliber self-loading pistol has a slide carried by a breech block slide of the gun with this slide projecting forwardly of the breech block slide so as to support the underside of a cartridge during initial rearward movement of the breech block slide as that cartridge is being extracted from the chamber. The slide also assists in preventing premature movement of a fresh round of ammunition upward from a magazine into the chamber.

Abstract: An automatic firearm of especially simple construction and easy maintainability, having an adjustable cyclic firing rate. The firearm has a receiver with an upper and lower portion. The upper portion defines a cavity in which a bolt assembly reciprocates. The reciprocation is maintained by a single compression spring in the cavity, and the length of the cavity, and compression of the spring, are adjustable to vary the cyclic firing rate. The firearm includes an especially simple trigger group arrangement. The lower receiver portion is structured to protect the trigger group. Also disclosed is an especially simple, yet practical ejector mechanism.

Abstract: A firearm comprises a chamber member, which is separate from the barrel and defines a chamber and which in a firing block, which is fixed to the receiver, is reciprocable between a firing position and a loading position in a direction which is transverse to the longitudinal direction of the barrel. When the chamber member is in its loading position its chamber is freely accessible and at one end communicates through a loading opening of the firing block with the interior of a magazine holder and at the other end communicates through an ejection opening of the firing block with an ejection shaft. For the performance of the loading and unloading operation, a slider is provided, which is movable in the longitudinal direction of the barrel and carries a feeder, which is movable from a first end position, in which the feeder is disposed on that side of the magazine holder which is opposite to the firing block, past said magazine holder toward the firing block as far as into the loading opening of said block.

Abstract: An automatic gun comprises a barrel, a receiver connected to the barrel and a bolt and bolt carrier mounted in the receiver for recoil and counterrecoil movement between the barrel breech and a recoil position rearwardly of a shell pick up position and a casing ejection port. The bolt carrier has a cam track formed along it and the bolt has a pivotally mounted casing extractor and an ejection recess in an opposite region. The forward end of a cam follower is pivotally mounted to the receiver forwardly of the pick up position. The follower has a pair of belt feeding pawls mounted centrally, an inwardly-directed ejection tip at the rearward end and a cam track follower in engagement with the bolt carrier cam track. A belt feeding adaptor is detachably connected to the receiver above the cam follower for receiving an ammunition belt. In response to forward bolt carrier movement, the cam follower is pivoted outwardly, moving the feed pawls into engagement with a belted shell outboard of the pick up position.

Abstract: A receiver assembly for a firearm slidably and rotatably carries a bolt having a non-rotating cartridge extractor-guide at the forward end which allows the bolt to rotate relative thereto and the bolt head has locking lugs which engage a locking surface in the forward or barrel end of the receiver when the bolt is in the firing position. A flexible feeding ramp in the firing chamber surrounds the extractor and serves as a cartridge guide and pre-loads the bolt axially in the firing position. A firing pin carrier assembly provides axial center line absorption of the firing mechanism forces while providing an off center firing pin tip required for rimfire ammunition. During the initial firing sequence the feeding ramp absorbs vibrations caused by the moving components of the firing mechanisms and the impact of the firing pin and the subsequent shock of ignition, and bullet movement.

Abstract: A bolt action rifle having a flange projecting from a ring captured between the barrel and the receiver, the flange mating with the undercut in the bolt needed to pass the cartridge during loading into the grip of the extractor to achieve controlled round feeding, the flange serving to support the cartridge during detonation in the area of the cartridge which otherwise would be unsupported.The mating of the flange with the undercut of the bolt requires a non-rotating bolt. An inner bolt sleeve is provided, axial movement thereof serving to control rotating locking lugs at the front of the bolt which lock the bolt during detonation.

Abstract: A pistol includes a barrel for holding a cartridge. A breech is movably mounted on a grip piece and movable relative to the barrel. The breech has opposed first and second claws resiliently biased for supporting a cartridge base. An ejector is received by the breech so that in response to movement of the breech relative to the barrel, the second claw slides from the cartridge base and the first claw engages the cartridge base for pivoting the cartridge for ejection from the barrel. An interchangeable barrel release mechanism lowers an end of the barrel in response to rearward movement of the breech relative to the barrel.

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 hand-held automatic firearm comprises a breechblock, which is longitudinally slidably guided and at its forward end has a standing face for engaging a cartridge, a hammer, which is adapted to be cocked by the breechblock as it recoils, a sustained-fire lever, which is controlled by the breechblock and catches the hammer as the breechblock advances, and an ejector, which is movable relative to the breechblock and ejects the cartridge case as the breechblock recoils. In order to provide a compact and inexpensive design, the sustained-fire lever comprises a follower arm, which protrudes toward the barrel and extends into a track groove, which is formed in the breechblock and opens into the standing face, and the follower arm has a free end, which acts as an ejector.

Abstract: A machine pistol for cartridges of different types comprises a barrel, a cartridge chamber within said barrel for housing a cartridge in a firing position, and a magazine for feeding cartridges to the cartridge chamber. A percussion pin is provided for firing the cartridge. A breech block is movable relative to the barrel for actuation of the percussion pin. A longitudinal portion of the breech block has a small radial clearance relative to a wall of the barrel and defines a semicylindrical chamber surrounding the barrel over a certain longitudinal length. The percussion pin is positioned in the wall of the barrel and is radially movable relative to the barrel under the action of a portion of an actuator device movable with the breech block.

Abstract: When a cartridge is inserted into the weapon barrel of a firing weapon by a forwardly and rearwardly reciprocatable breechblock, a front end surface of the breechblock impacts against the base of the cartridge. The cartridge to be inserted must be secured so that it cannot slide off such front end surface of the breechblock during cartridge insertion. This cartridge securement is attained in that the cartridge is held against radial displacement by an extracting or withdrawal claw and diametrically opposite thereto by means of a securing cam or lug provided at a feeler element or pin. To eject the empty cartridge case and during the insertion of the next cartridge, the feeler element or pin together with the securing cam or lug is pushed back by means of a control cam or rail.

Abstract: The disclosure relates to an automatic gun which employs case ejectors (1, 1') for realizing extraction and ejection of the cartridge case from a spent round. The case ejector is also utilized for arresting the breech block during the recoil of the weapon and holding the breech block in an open position so that ramming home of a new round (3') may be executed. The ejector is exposed to the round in process of being rammed home, which round, during its thrust towards the homed position in the barrel, entrains the ejector so that the breech block (2) is released and may execute its closing movement int. al. with the assistance of spring means placed under tension during the opening movement of the breech block. The ejector and the breech block are designed with cooperating arrest and abutment surfaces which take up portions of the kinetic energy of the round which is in the process of being rammed.

Abstract: The present invention relates to a locking lug insert which is inserted into the locking lug recess of a bolt action receiver. The insert defines a central aperture aligned with an elongated chamber in the receiver and one or more cut-out portions opening into the central aperture, one cut-out aligned with each locking lug groove. The cut-out portions are equal in number to the number of locking lug grooves formed in the receiver. The cut-out portions are sized so as to accommodate the locking lugs of the bolt when the bolt is in its closed position. The insert is caused to rotate in the locking lug recess when the bolt rotates, due to the interengagement of the locking lugs, with the cut-out portions.

Abstract: An active protection system (10) is disclosed as having a launch tube (12) with a round inner bore (44) that tapers from an open muzzle end (42) thereof toward a closed rear end (40) to facilitate loading of a cartridge (26) and to permit ejection thereof after firing. The cartridge (26) utilized has a metal case (28) that provides a liner for the launch tube and includes a sabot (116) for launching at least one projectile (120, 122) upon ignition of a propellant (114) by an ignitor (126). Transverse force is generated by utilizing a plurality of projectiles (120, 122) preferably embodied by an outer ring of cubical projectiles (120) and spherical projectiles (122) received within the outer ring so as to provide projectile dispersion that increases the probability of an impact with the intended target.

Abstract: Before the empty cartridge case is ejected it is extracted from the cartridge chamber of the weapon barrel by an extractor and subsequently tilted by an ejector. During this operation large forces are exerted on the pivotably mounted extractor. It has been found that when high cadence firing takes place the spring forces are too small to hold the extractor reliably. Therefore, the extractor is secured by a support lever or by a locking pawl against inadvertent pivoting during the removal of the cartridge case. Preferably a support lever or support slide is arranged in the breechblock to prevent premature tilting of the cartridge case.

Abstract: This invention relates to a firearm and more particularly to a firearm having a bolt action in which a bolt is arranged for axial and rotational movement in a receiver and an extractor system operable in combination with the movement of the bolt relative to the bolt receiver. The bolt includes lugs having a locking surface which engages a locking wall formed on a cooperating lug on the receiver when the bolt is in the firing position. Both the locking surface and locking wall are arranged at cooperating angles and are conically shaped so as to insure that the axis of the bolt and receiver will be concentric when the bolt is locked in the firing position. In the event of a cartridge rupture the angle of the locking wall causes some of the forces generated by the rupture to be diverted at an angle from the axis, thereby minimizing the shearing stresses on the receiver lugs.

Abstract: A falling block rifle action which is cocked by the downward movement of the breechblock and which includes a safety mechanism for blocking not only a trigger movement but also the movement of the striker and other interconnecting linkages. An adjustable extractor mechanism coupled to the cocking lever in central relation to the chamber accommodates a wide variety of types and sizes of cartridges.

Abstract: An ejector for automatic pistols having a reciprocating breech block, or slide, the ejector capable of being manually moved from an operating cartridge ejecting position to a disassembly position where it lowers a frame-mounted firing pin block and permits the slide to be disassembled by sliding forwardly. A slide latch arrangement permits the slide latch pivot axle to be held in a partially withdrawn mode during disassembly. When the pistol's magazine is in place, it holds the ejector in the operating position.

Abstract: In a fire arm of the self loading pistol type having a reciprocating breech block slide (B) with a detachable breech block insert (F) holding a cartridge extractor (M) and a firing pin (S), the insert (F) is held in position in the slide (B) by means of the rear sight (N) of the fire arm. The rear sight is of bifurcated construction, the two limbs locating in respective vertical slots in the sides of the insert (E) and the top in a transverse slot in the slide (B). One limb (N3) of the bifurcation may contain screw means for adjusting the height of the rear sight, such adjusting means thereby being protected against damage and dirt.

Abstract: A rifle breech assembly comprises a housing adapted to receive the barrel at one end and slidably to receive the breechblock at the other end. The latter carries at its forward end locking bosses, and the housing is formed with grooves which receive the locking bosses and open into an annular recess defined by the rear end of the barrel and permitting a rotation of the breechblock. The breechblock is provided with a resilient pivotally movable extractor disposed between two locking bosses and terminating in an extractor hook. The inside surface of the housing wall constitutes adjacent to the annular recess a surface for radially supporting the extractor hook when the breechblock is locked. A recess which permits a pivotal movement of the extractor is disposed beside that supporting surface in the peripheral direction.

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: Hand held rifles and pistols employing a novel bolt firing pin configuration and controls therefor which effectively absorb the effects of the shell explosive forces.

Abstract: In automatic firearms having a caliber in the range of about 20 to 40 mm, so-called "jammed shell casings" are occasionally encountered due to the high cadences during the extraction and ejection of the empty cartridge casings, so that the returning breech mechanism tends to lose the cartridge, and the ejector plunger no longer fully impacts against the casing to be ejected. In order to avoid this drawback a recess arranged in the breech head concentrically to the firing pin is provided along its periphery opposite an extractor claw with at least one projection to assist in the centering and retention of the cartridge casing and which can be adapted to the respective type of breech mechanism. The projection is formed by cutting or non-cutting working. Preferably, two or more such projections are formed which then, together with the extractor claw, form a type of "three-point support" for the cartridge casing during the extraction.

Abstract: An auto-loading or semi-automatic firearm having a reciprocating bolt and a magazine positioned below the path of the bolt. The bolt has a longitudinal recess therein and finger means mounted adjacent the bolt which extend into the bolt recess. The finger means are caused by magazine action, after the last discharge, to exit the bolt recess and restrain bolt movement.

Abstract: A bolt assembly includes a locking lug bored to slidably receive both a bolt hold down plunger and a cartridge extractor pin jointly actuated by an interposed coil spring. An extractor is rockably mounted adjacent the bolt forward end and urged by the extractor pin into gripping engagement with a cartridge rim for extracting same from the gun barrel chamber. The extractor includes a stem loosely received in a bolt defined recess.

Abstract: A bolt action firearm incorporating a bolt head member attached to the head end of the bolt, with an extractor ring secured between the end of the bolt and the bolt head such that the extractor ring firmly retains the extractor within a recessed slot in the bolt head. The bolt head member is adapted to engage a locking ring which is, in turn, securely held in place in the receiver by the barrel.

Abstract: An ejector for firearms which use projectiles without cases of the new design with a perimetric primer. Such an ejector may be used on any type of gun which is equipped with a radial percussion system designed to percuss such projectiles.Used with the projectiles without cases, the ejector should eject from the detonating chamber of the gun only those projectiles on which the firing pin has not provoked the detonation of the charge at the moment of percussion.At the same time since it is impossible to prevent from time to time during firing the occurrence of defective projectiles which remain in the barrel, during the phase of introduction into the detonating chamber the ejector should be able to hook onto every single projectile, retaining hooked onto it only those which, due to defects, remain in the detonating chamber and leaving all the others free to come out of the mouth of the barrel.

Abstract: A firearm especially for firing large calibre rounds such as rubber bullets and having a magazine in which a plurality of rimmed rounds may be stacked in contact with one another, the magazine being rechargeable at any stage of depletion. The firearm includes a catch mechanism which locks a round in the breech on insertion, permits the rim of a round to ride forward over the rim of a previously-inserted round without fouling, and the extraction of a spent round rearwardly without its rim fouling a previously-inserted round. Mechanism for firing, automatic feed, and automatic extraction and ejection of spent rounds is described.

Abstract: Disclosed is a semi-automatic firearm which has a configuration generally similar to a known form of submachine gun insofar as it comprises an elongate receiver, a pistol grip extending downwardly from the receiver and forming a housing for a cartridge magazine and a trigger mechanism and sear located forwardly of the pistol grip. The firearm operates on the blowback principle with closed breech type operation and employs a slidable bolt and separate slidable firing pin striker mechanism within the receiver, with the bolt being freely slidable and the sear operating on the striker mechanism. The trigger mechanism only has a semi-automatic and a safety setting and the bolt face has a feed lip of a design which causes the firearm intentionally to jam under certain abnormal operating conditions.

Abstract: An ammunition feeder for a gun is disclosed which has a first rotating sprocket driven positively at a uniform velocity for stripping rounds and a second rotating sprocket driven positively at a non-uniform velocity for transversely placing each round directly onto the face of the gun bolt of the gun.

Abstract: A firearm is disclosed for firing caseless ammunition. The firearm fires projectiles by ignition of a separate propellant cartridge disposed therebehind, the projectile carrying a primer charge for igniting the propellant cartridge. The firearm comprises a body including a receiver, a barrel connected to the receiver, and a firing chamber communicating with a bore of the barrel. A mechanism is provided for feeding a projectile and a propellant cartridge therebehind into the receiver. A bolt is slidably mounted in the body and includes laterally open pockets for receiving the fed projectile and cartridge and for advancing them to an armed position within the firing chamber. A portion of the bolt is arranged to ignite the primer charge when the projectile reaches the armed position. The primer charge is disposed within a metal casing, the latter being mounted by friction fit within a recess of the projectile.

Abstract: A fire-arm having a bolt assembly which includes a bolt received by a bolt carrier and axially movable relative thereto and a T-shaped ejector set freely in a T-shaped recess in the bolt and retained in the recess by the bolt carrier while being held axially relative to the bolt by the T-shape of the extractor and the recess. In a first position of the bolt relative to the carrier the extractor is held in a first position in which it engages a cartridge for extraction from the chamber and in a second position of the bolt relative to the carrier the extractor is movable to a second position from which it can move to engage a cartridge.

Abstract: A programmed shell casing ejector apparatus, for an automatic cannon having an axially reciprocating bolt assembly, includes an ejector member axially slidably mounted to the bolt assembly, a pair of cam tracks symmetrically fixed to a cannon mount, and a corresponding pair of cam track followers pivotally mounted to the bolt assembly to engage the ejector member and, as the bolt assembly recoils, the cam tracks. Ejection through an ejection port of a fired shell casing, held to a bolt face by an extractor, is caused when the ejector member is moved forwardly relative to the recoiling bolt assembly by the cam track followers as the followers move along the cam tracks.

Abstract: A cartridge extractor, comprising a resilient ring segment formed with a claw, is mounted within a recessed bolt face without a rivet. The wall of the bolt recess is formed with an arcuate clearance cut, radius cuts at either end of the clearance cut, and projecting lobes at the junctions of these cuts. The extractor ring has its free ends bent to form detent arms, which are seated in the radius cuts to support the claw in a position to engage a cartridge base as it enters the recess. This deflects the ring into the clearance cut, guided by the detent arms sliding over the lobes. When the claw seats in the extraction groove of the cartridge, the ring is guided back to its original position by the detent arms re-seating themselves in the radius cuts.For use in auto-loading firearms whose bolts rotate violently, a means is added to prevent relative rotation of the extractor ring, without interfering with its normal deflection.

Abstract: A cartridge ejector for a recoil-operated gun. In prior art guns of the ril-operated type if the gun fails to fire the lack of recoil force prevents the gun from continuing to fire. To allieviate this situation a manually-controlled charging mechanism is operated to draw the bolt carrier back to the full recoil position. Under the present invention the charging mechanism is augmented by a spring-urged piston that propels a special striker arm against the ejector rod carried by the bolt assembly. The ejector rod forcibly impacts the base of the ufired cartridge to eject it from the gun.

Abstract: A single barrel gun has a rotary operating mechanism which is symmetrical about the longitudinal axis of the gun barrel and a feeder for ammunition.

Abstract: An automatic pistol of the breech block type which is interconvertible to fire sub-caliber cartridges. The frame, handle, slide, ejector and firing mechanism of the larger caliber pistol are used when converting for sub-caliber usage. A sub-caliber barrel is mounted in the slide and detachably connected to the frame by a pivotal link. An interchangeable barrel bushing adapted to support the forward end of the sub-caliber barrel is inserted in the slide. At the forward end of the slide a recoil spring is tensioned to operate the slide upon firing of a sub-caliber cartridge. A sub-caliber magazine is inserted in the handle. The extractor is cambered and is sufficiently flexible to capture and extract cartridges of both calibers. The cartridge locating recess in the breech face is that of the larger caliber.

Abstract: An automatic and semiautomatic small caliber conversion system for automatic or semiautomatic shotguns and rifles such as, for example, M-16 and AR-16 rifles, including a uniquely three element structure and associated ammunition feeding means to permit the use of smaller caliber, inexpensive ammunition in rifles and shotguns designed originally for larger caliber ammunition. The system includes a bolt/receiver assembly which easily replaces the bolt carrier of the, for example, M-16 rifle, and a magazine assembly which can be inserted by hand into any standard, for example, 0.223 round M-16 magazine. The bolt/receiver assembly is made up of three sub-assemblies, a receiver, a bolt, and a recoil spring. The receiver sub-assembly includes a section of a circle with a short barrel section in the front which fits into the M-16 chambers, a receiver lug at top rear to locate it within the M-16 chamber and prevent its rotary or linear motions and a guide rail.

Abstract: In the embodiment of the invention described in the specification, a shotgun includes a bolt containing a slidable firing pin and a spring urging the firing pin away from the breech of the barrel. A shell extractor pivotally supported in the bolt has a retainer which is urged forwardly by the firing pin spring.

Abstract: A firearm for firing caseless ammunition includes a barrel, a receiver, a bolt, and a firing pin. The bolt includes laterally open pockets for receiving a projectile and a separate propellant cartridge. The bolt carries an extractor to extract unspent projectiles. The bolt drives a locking collar to lock itself in forward position. The locking collar is unlocked by the recoil-action of the firing pin. The firing pin is driven by a spring biased hammer; the firing pin then drives the hammer by recoil action, causing the hammer to unlock the locking collar. A gas seal for the firing pin includes a deformable ring which is deformed by ignition gas pressure into sealing engagement with the firing pin. An anti-recoil muzzle at the discharge end of the barrel has a reaction surface thereof cleaned of combustion deposits by a plurality of bristles extending from the barrel. A propellant cartridge comprises a plurality of telescoping nitrocellulose jackets which form a propellant chamber and a primer compartment.

Abstract: A unitary bolt and chamber adapter for field replacement, without tools, of the conventional bolt assembly of rifles of the type M16 and AR-15 provides for the use of conventional .22 caliber long rifle rimfire ammunition in the rifle instead of the larger conventional centerfire ammunition. The bolt functions in semiautomatic fire by conventional blowback action. Through cooperation with an improved .22 caliber rimfire magazine adapter, the breech automatically remains open after firing the last round from the magazine. The bolt guide rails are flexibly attached to the chamber providing for reliable operation in a larger number of rifles. A spring actuated forward locator on the bolt assembly keeps the adapter seated in the rifle chamber, compensating for differences in gun receiver lengths. An undercut bolt face provides the positive extraction of a double extractor system with a single extractor, and a groove-and-land chamber adapter provides reliable operation with good and poor quality ammunition.

Abstract: A combined one piece cartridge case ejector and ejection spring useful in guns which have non-locking bolts for which conventional coil spring ejectors are not feasible. The device comprises a solid piece of elastic material such as hard rubber or nylon which is arranged in the path of the rearward travel of the spent cartridge case following firing and diametrically opposite from the extractor. This structure provides positive ejection of spent cartridge cases without damage thereto. The invention is of particular utility with cartridge cases with centers of gravity far to the rear thereof, which require high torque for positive ejection.

Abstract: This combined ejector-rammer, or ejectomer, is a single mechanical device ich performs the functions of both an ejector and a rammer for small arms which use cartridge type ammunition. An ejectomer lever is attached to the side of the weapon's bolt by means of a pair of pins and a spring. The pins move in elongated slots in the lever, one of which is linear and the other L-shaped. The forward end of the lever acts as a rammer to push each fresh round up a ramp into the firing chamber. After firing, a conventional extractor removes the spent cartridge case from the chamber and as the spent case moves down the ramp, the spring and the pins cause the lever to move in such a way that the extracted case is ejected.