Abstract: A compensated barrel shroud that encloses and supports a firearm barrel provides a first portion of the shroud for receiving the barrel that extends from the firearm frame to an end of the barrel. There is a second larger inner diameter portion extending from the end of the barrel to a forwardmost outer end of the shroud. The barrel and shroud are screwed together by interengaging threads positioned adjacent the end of the barrel. The end of the shroud has a decreased diameter exit hole defining an expansion chamber within the second larger inner diameter portion. At least one slot is formed along a top surface of the second portion to allow expanding propellant gas from within the second portion to escape. The slot is sized and arranged to provide a downward thrust to the barrel shroud to compensate recoil forces generated in firing a round.

Abstract: Disclosed is a flash suppressor for guns which controlledly vents ignited gh pressure gas exiting a gun muzzle. The gas is vented essentially radially outward through coils or rings of the suppressor in a 360 flow degree pattern away from a longitudinal axis of the suppressor.

Abstract: A ballistic optimizing system for use on a preferably bedded rifle comprising a movable weight element secured to the end of a rifle barrel such that said weight element can be moved axially along said barrel to change the effective weight applied for dampening purposes and having an indicator for indicating the relative position of said weight element on said barrel and further including an additional weight releasably secured to said movable weight element and ports through said weight element to allow gas escape.

Abstract: A short length shotgun barrel exhibiting high accuracy and reduced felt recoil, and providing for interchangeability of loads containing shot pellets and slugs. The barrel includes an elongated and tapered forcing cone, a backbored region between the muzzle and the forcing cone, venting ports positioned in the area of the muzzle, and a muzzle region of smaller diameter than the backbored region. The nominal inside diameter of the barrel from the forcing cone to a point adjacent the muzzle is greater than the muzzle diameter. Radially projecting ports are provided in the transition area of the backbored region near the muzzle end of the barrel, and the area surrounding the venting ports is roughened. The forcing cone is elongated and tapered down from the chamber toward the muzzle end of the barrel.

Abstract: A short length shotgun barrel exhibiting high accuracy and reduced felt recoil, and providing for interchangeability of loads containing shot pellets and slugs. The barrel includes an elongated and tapered forcing cone, a backbored region between the muzzle and the forcing cone, venting ports positioned in the area of the muzzle, and a muzzle region of smaller diameter than the backbored region. The nominal inside diameter of the barrel from the forcing cone to a point adjacent the muzzle is greater than the muzzle diameter. Radially projecting ports are provided in the transition area of the backbored region near the muzzle end of the barrel, and the area surrounding the venting ports is roughened. The forcing cone is elongated and tapered down from the chamber toward the muzzle end of the barrel.

Abstract: An improved shot gun barrel comprising of a cylinder bar with predetermined slots specifically shaped and positioned along the barrel to reduce muzzle size, recoil and noise.

Abstract: A compensated barrel shroud that encloses and supports a firearm barrel provides a first portion of the shroud for receiving the barrel that extends from the firearm frame to an end of the barrel. There is a second larger diameter portion extending from the end of the barrel to a forwardmost outer end of the shroud. A securing nut engages threads at the end of the barrel and secures the barrel shroud to the barrel. An end cap is positioned at the forwardmost end of the shroud. The end cap has an outer hole with an inner diameter substantially equal to an inner of the barrel thereby forming an expansion chamber within the second portion. A plurality of slots are formed along a top surface of the second portion to allow expanding propellant gas from within the second portion to escape out of the slots. These slots are sized and arranged to provide a downward thrust to the barrel shroud to compensate recoil forces generated in firing a round.

Abstract: A light armor piercing weapon, which is hand carried by a single man, is provided for firing or launching armor piercing rocket propelled projectiles. A propellent pack is worn or carried by the soldier along with a launching rifle. Unsymmetrical dimethylhydrazine is provided as a propellent and inhibited red fuming nitric acid, Type IIIa, is provided as an oxidant in a combustion chamber in the rifle. The explosive combination of the propellent and oxidant propels the projectile out of a smooth bore barrel and simultaneously ignites the solid propellent in the projectile. The projectile is provided with a disposable sabot which seals the projectile within the smooth bore. The projectile is provided from a spiral drum magazine which is gear driven by a mechanical coupling with a reciprocating breech block within the rifle. The reciprocating breech block in turn is gear driven by a gas driven piston communicated with the barrel.

Abstract: A group of upwardly directed ports disposed in a barrel of a hand held firearm intermediate the chamber and the muzzle of the firearm vent propellant gasses upwardly upon discharge of the firearm to produce a downwardly directed component of thrust to counteract gun rise and muzzle jump. Preferably, the center of the group of ports is in the vicinity of midway between the chamber and the muzzle. The ports may be straight or tapered passages or they may be nozzles.

Abstract: The present invention comprises a self-actuating blow forward firearm having a fixed breech block located to the rear of the firearm. A cartridge feeder provides a supply of cartridges to the loading area so that the firearm can be used as an automatic or semi-automatic weapon. The firearm also contains an outer receiver tube and a movable inner gun barrel which is biased toward the rear of the firearm by a spring disposed in a chamber between the receiver tube and the inner movable barrel. When the trigger mechanism is activated, the action of the bias spring causes the inner movable barrel to move backward toward the breech block striping a cartridge from the feeding device and forcing the end of the cartridge against the firing pin on the breech block. The bullet is fired down the bore of the inner movable barrel. The movement of the bullet along the bore of the inner movable barrel drags the barrel forward against the action of the bias spring.

Abstract: A muzzle brake (10) for a gun barrel (12) to be attached coaxially onto the muzzle end of the gun barrel up to a radially extending annular abutment surface (20) and provided with elongated gas discharge openings (14) which are arranged transversely to the axis of the bore (16) over its lateral effective length region (L.sub.2) and have a minimum opening length (L.sub.1) at the rear of the effective length of the muzzle brake (10), i.e., adjacent the position of the abutment surface (20), the axial inner bore (18) of the muzzle brake (10) has an inner diameter (d) which corresponds to the rifling diameter (d.sub.1) of the gun barrel (12) and its rear end ends at the radially extending abutment surface. The gas discharge openings (14) are provided with rearwardly sloped baffles (24) and gas guide surfaces (26) which have different lengths in the rear region of the muzzle brake (10) and have the same opening length (L.sub.1) in the forward region.

Abstract: A compensator for fire arms includes a barrel bushing, outer tubular housing, and an inner tubular choke which defines an annular gas expansion chamber; the inner tubular choke has a plurality of holes formed therein which provides gas communication between the bore of the barrel, interior of the inner tubular choke, and annular gas expansion chamber; and spaced longitudinally extending slots are provided to the top and bottom of the outer tubular housing for gas communication between the annular gas expansion chamber and atmosphere, the ratio of the area of the slots in a top surface of the outer tubular housing to the area of the slots in the bottom of the outer tubular housing are about 3 to 1.

Abstract: An improved muzzle brake having a generally upward opening void from which escaping gases create a downwardly directed reaction force and a sloping face on which the propelling gases collide and expand and deflect to either side and upward of the muzzle brake to defeat the natural tendency of the muzzle of a weapon to climb and drift. Below the generally upward opening void, within the floor of the bore of the muzzle is a venturi trough in which a lowered pressure region of propelling gases is created by the high speed passage of the propelling gases down to the bore of the muzzle brake. This lowered pressure region within the venturi trough is still in excess of the environmental pressure exterior of the muzzle brake so that gases within the venturi trough escape through channels directed downwardly and to the left and right of the projectile path.

Abstract: A compensator is described, having a primary venting system that directs high pressure gas in a downward direction, thereby creating a dynamic or resistive force as the gas bears on the bottom surface of the compensator housing before being redirected at upward angles. This primary systems works to push the compensator down thereby negating muzzle flip. A secondary venting system, which consists of one (or more) cylindrical gas expansion chamber(s) forward of the downward vent, works in combination with the primary system by allowing residual lower pressure gases to expand and disrupt within the expansion chamber(s) before being vented in an upward direction. This secondary system creates a passive action in that the gas is not directed to bear on any particular surface, but is allowed to expand and bear on all available surfaces before venting upwards thereby creating an additional downward force further reducing muzzle flip.

Abstract: A muzzle blast deflector for use on a rifle having a recoil arrestor attached to the muzzle. The blast deflector is a metal cone having a central opening for installing on a threaded muzzle barrel. The recoil arrestor is threaded on the muzzle and holds the blast deflector in place. The cone projects forward and beyond gas ports of the arrestor. Expanding gases from the recoil arrestor are deflected forward, preventing shock waves from the gases from traveling toward the shooter.

Abstract: The safety of semi-automatic pistols and like firearms is improved by making them double action only combined with novel features that include use of roller bearings for support of trigger and sear assemblies, structuring them for constant pressure trigger pull, automatic blocking the firing pin from reaching the cartridge until the firearm is fully locked in the battery position and structuring operation of the sear so it can engage the firing pin only when the trigger pulls it rearward.

Abstract: A muzzle recoil brake which enables propellant gases to escape through a sequence of expansion stages along the length of the brake. Each expansion stage includes circumferentially disposed passageways or apertures which permit gases to exit the brake. The expansion stage also includes gas expansion chambers. Interior plates transversely positioned and axially spaced define interior expansion chambers while caps comprising radially extending plates and circumferential skirts define exterior expansion chambers. The gases from the brake impinge the interior surfaces of the expansion chambers to reduce recoil. Gases are conserved in the brake and a metered portion of the gas is vented at each stage in the sequence of stages. The size or position of the vent aperture or expansion chamber with respect to adjacent apertures or chambers, or a combination thereof, permits retention and conservation of the propellant gases.

Abstract: A muzzle brake for firearms including a housing positioned at the end of a gun barrel which defines a gas receiving expansion chamber. A plurality of vent slots or openings are formed in the housing and are oriented to direct escaping gases from the chamber in an upwardly or upwardly and rearwardly direction. The chamber and slotted housing are so defined that reverberating shock waves build up within the chamber and escape sequentially so as to substantially increase the duration of the upwardly and rearwardly directed gas venting pulse and thus retard upward muzzle jump of the gun barrel and minimize the felt recoil experienced by the user. The muzzle brake apparatus may be adjustable to provide for selective muzzle deflection in any suitable direction or to neutralize muzzle deflection.

Abstract: An improved flash suppressor for attachment to the muzzle end of the barrel of a firearm comprising a generally cylindrical body member having a first portion adapted to receive a projectile from the barrel and a second portion adapted to receive a projectile from the first portion, the first portion having a longitudinal smoothbore passage therethrough through which a projectile discharged from the barrel passes, the second portion having a longitudinal passage with an inside diameter significantly greater than the inside diameter of the first portion passage, a smooth tapered transition wall connecting the longitudinal passages of the first and second portions, a pair of diametrically opposed longitudinal vent slots in the second portion and extending from the distal end of the second portion toward the first portion whereby the second portion comprises a pair of furcations, and at least one radially directed vent opening formed in each of the furcations.

Abstract: An automatic machine pistol is provided, which is not subject to fouling, which is compact and light while incorporating a pneumatic recoil buffer, which resists muzzle climb, and which can be accessed and cleaned without disassembly. The machine pistol is comprised of a reciprocating bolt within a housing of the pistol. The reciprocating bolt is carried within the housing on four rails by eight roller bearings. No sliding contact is made between the bolt and any other portion of the pistol. A portion of the high pressure gas from the barrel is bled through a bleed hole in the barrel block or barrel into a gas port tube which is telescopically inserted into the bolt. The gas port tube delivers the portion of the discharge gas in a forward direction in opposition to the motion on recoil. An upwardly directed nozzle is communicated to the receiving bore within the bolt.

Abstract: A barrel and recoil compensator for a slide-type automatic pistol comprising a tubular cylindrical body member having an internal bore for forming a gun barrel and an axially movable slide chamber assembly surrounding the cylindrical body member said cylindrical body member having at one end portion for detachably securing the cylindrical body to said pistol, an opposite end portion and a shoulder portion therebetween the shoulder portion forming a first stop for the slide chamber assembly, the opposite end portion having an enlarged end cap forming a second stop for the slide chamber assembly and a reduced external diameter area adjacent the enlarged end cap, venting aperature formed through the wall of said cylindrical body member about said reduced external diameter area for venting gases from the bore of said cylindrical body member, said slide chamber assembly having at least one gas vent.

Abstract: A fire arm includes a body and a handle carried thereby as well as first and second barrels secured to the body. The second barrel is secured below the first barrel. A first loading mechanism is located in the body for loading the first barrel and a second loading mechanism is loacted in the body for loading the second barrel. A first magazine is selectively secured to the body for supplying the first loading mechanism and a second magazine is selectively secured to the body for supplying the second loading mechanism. The second magazine is spaced from the first magazine. A firing mechanism, which is located in the body allows a sequential firing of the first and second barrels.

Abstract: An attachment for a gun has a plurality of pressure relief ports positioned on the barrel that create pressure differentials which impart a rotary motion to the projectile which stabilize the projectile in its ballistic path. The pressure relief ports allow the gun to spin stabilize the projectile without the provision of rifling in the barrel. The pressure relief ports can further be arranged to reduce recoil and barrel rise associated with firing the gun.

Abstract: A muzzle brake for a firearm is formed from an elongated tubular sleeve that has a plurality of circular rows of apertures drilled from its outer surface to its inner bore. The circumferential spacing between each of the apertures in each row being such that they intersect the adjacent appertures on both sides of them at a point intermediate the wall thickness to produce integrally formed baffles in the interior of the tubular sleeve. The baffles function to reduce the recoil of the firearm and further to aid in directing the propellant gases of a bullet radially outwradly through the radial apertures of the muzzle brake.

Abstract: The invention is directed to a compensator 4, 4' for a hand-held firearm 1. Herein it is provided that the compensator is connected solidly with the grip or stock 2; however, that it is possibly connected so as to be removable.In one embodiment, the compensator 4, 4' is arranged detachably on an extension of the grip 2', which on its part is fastened to the grip 2 preferably detachably.The invention enables an ideal force introduction from the compensator 4, 4' into the grip 2, causes no complications when disassembling the weapon and allows the utilization of compensators respectively adapted to the ammunition.

Abstract: A group of upwardly directed ports disposed in a barrel of a hand held firearm intermediate the chamber and the muzzle of the firearm vent propellant gasses upwardly upon discharge of the firearm to produce a downwardly directed component of thrust to counteract gun rise and muzzle jump. Preferably, the center of the group of ports is in the vicinity of midway between the chamber and the muzzle. The ports may be straight or tapered passages or they may be nozzles.

Abstract: A shoulder-fired semi-automatic rifle including an elongated housing, a barrel projecting forward from the housing, a bolt mechanism within the housing including a firing pin having a sear mechanism and a magazine depending from the housing and cooperating with the bolt mechanism. A shoulder seat depends from the housing immediately behind the magazine and is spaced substantially forward of the rear end of the housing. The trigger and trigger hand grip are mounted forward of the magazine. The trigger, spaced substantially in front of the sear mechanism, is connected to the sear mechanism through an elongated link member. A front hand grip also depends from the front portion of the housing in front of the trigger. The housing may also be provided with an upward projecting carrying handle located above the center of gravity of the rifle, when extending longitudinally horizontal.

Abstract: The invention is an improved muzzle brake with the outer appearance of a perforated metal cylinder and an inner chamber composed of cylindrical sections, tapering sections, conical sections, and abrupt and gradual changes between the various sections. The brake is intended to be attached to the muzzle of a gun such as a rifle, pistol or shotgun. Holes running radially from the surface of the brake into the inner chamber divert a portion of the propelling gases away from the normal direction of such gases, resulting in a reduction in recoil. The holes are spaced about the surface of the brake along spirals. The use of many small regularly patterned holes results in a decrease in the perceived discharge noise.

Abstract: A device for reducing the felt effects of recoil in firearms including at least a barrel and a frame, this assembly including a muzzle brake unattachedly disposed around the muzzle portion of a barrel wherein the barrel completely traverses the muzzle brake. The muzzle brake is provided with deflector surfaces for upwardly deflecting pressurized gases generated during the firing of a projectile. The gases are directed against the deflector surfaces through gas outlet openings formed in the portion of the barrel transversing the muzzle brake, these gas outlets aligning with the deflector surfaces. The device further includes a retention means for securely retaining the muzzle brake to the firearm frame in relation to the longitudinal axis of the barrel. Such a device allows for the use of the combustion gases for reducing the effect of recoil, while advantageously avoiding the problems associated with precision alignment of the muzzle brake and the barrel.

Abstract: A muzzle brake and tool for effectively installing the brake on the muzzle end of a rifle without the necessity of engaging the services of a gunsmith. The tool for installation includes a handle assembly, a bore pilot and an insertable threading die and cutter and cutter holder by which the owner of the rifle can effectively trim the end of the barrel and then form threads on the external surface of the barrel onto which the muzzle brake can be screw threaded. The muzzle brake is a hollow cylindrical member having an internally threaded end engaged with the externally threaded end of the muzzle of the rifle together with two flat sides and four vents extending horizontally when installed on the rifle barrel with the vents being equally spaced and equally sized and communicating the hollow interior of the muzzle brake with the atmosphere to release gases thereby reducing recoil felt when the gun is fired.

Abstract: In the case of weapon barrels which are only secured at one of their ends at the weapon housing during firing of the weapon there occurs, particularly during series firing, bending vibrations or oscillations which impair the hit probability of the fired projectiles. In order to preclude or at least dampen such bending vibrations of the weapon barrel the invention contemplates securing a vibration damping device or damper at the muzzle of the weapon barrel. This vibration damper comprises an inertia body which is resiliently connected with the weapon barrel muzzle. Also provided is a brake device which dampens the movement of the inertia body relative to the weapon barrel. The inertia body preferably comprises two ring members which are pressed by springs against two disc members which are rigidly attached to the weapon barrel muzzle. Between the weapon barrel and the ring members of the inertia body there are arranged resilient elements, such as blade or leaf springs.

Abstract: A muzzle brake having improved recoil, stabilization and blast control is comprised of a one-piece housing member securable to the muzzle end of a gun barrel and cone-shaped closure member with a relatively long outlet passage. A spent gas bulk head formed integrally with the tubular housing member is positioned a short distance from the barrel muzzle and has a bullet passage therein which is 50 percent longer than prior art passages for better stabilization. Spent gas vents in the first and second chambers causes significantly more spent gases to be vented to the atmosphere before the bullet leaves the muzzle brake and, at the same time, provides better stabilization, concussion and blast control. Spent gas vents in the first chamber are on the top side and angulated away from the muzzle to control the direction of the muzzle blast and concussion away from the shooter and avoid kicking up dirt or sand when shooting from a prone position.

Abstract: A noise and recoil suppressor apparatus for high powered rifles includes a tubular body with an inner central cylindrical bore and an outer cylindrical surface. A butt end portion of the tubular body is adapted for attachment to the muzzle end portion of a high powered rifle and the body provides an opposite tip portion. An annular rib extends outwardly from the outer cylindrical surface and is positioned adjacent the butt end portion of the tubular body. A plurality of space apart latterally extending cylindrical openings extends between the bore and the outer surface of the tubular body, the first plurality of openings being spaced along the tubular body beginning at the tip portion and terminating at the annular rib. A second plurality of openings extends at an acute angle with respect to the bore axis between the bore and the outer cylindrical surface adjacent the annular rib. The second plurality of openings are positioned generally between the annular rib and the first plurality of openings.

Abstract: A muzzle brake system is described for use in connection with the barrel of a firearm to prevent recoil and muzzle jump upon firing of the firearm. The muzzle brake system includes an expanded chamber, larger than the bore of the barrel, located at the muzzle end of the barrel. A plurality of openings are provided through the upper portion of the barrel to communicate with the chamber to permit escape of gases when the firearm is fired.

Abstract: An automatic or semi-automatic pistol is made substantially of polymer materials. The pistol includes polymer upper and lower receivers and a polymer barrel attached to the upper receiver. The operating mechanism includes a bolt, block and a hammer, slidably mounted in the fixed upper receiver with the bolt and block and the hammer being separately springloaded. A gas operated link is positioned to rotate the pistol block from a locked to an unlocked position when actuated by gas from a fired cartridge. A gas port extends from the end portion of the barrel to one end portion of the gas operated link to move the link responsive to the gas pressure to thereby unlock the block so that the block, bolt and hammer can be operated by reaction to the gasses still in the weapon barrel.

Abstract: An anti-recoil device can be mounted on the muzzle end of a firearm. The device includes a barrel extension, and provides a weight surrounding the barrel extension. Gas from the bore is diverted to move the weight forward, preferably at the speed of the bullet; then, the weight is abruptly stopped when the bullet leaves the muzzle. The forwardly directed force to stop the weight effectively counteracts the rearwardly direction force of the muzzle recoil. A washer of an elastomeric material can be used at the stop to prevent damage to metal parts, and to distribute the stopping over a short period of time.

Abstract: A relatively simple repeating firearm is disclosed which includes a sliding bolt which is removably housed within a firearm housing and which is biased into a bullet loading and firing position by means of springs provided in an overlapping fashion with a longitudinal extent of the bolt to thereby reduce the overall length of the firearm. A short stroke for the sliding bolt is provided to enable a rapid firing of the firearm. The sliding bolt and firing mechanism contained thereon are easily removed from the housing by a removable rear cover with the firearm accommodating different calibers of bullets by replacement of the sliding bolt as well as a removable barrel which contains the firing chamber therein.

Abstract: A dually-adjustable device for firearms is provided which is attached to the muzzle of a firearm to stabilize the muzzle and to suppress the flash during firing. The device is dually adjustable to counter both the magnitude and direction of firing forces. The device is further adjustable to individual firing characteristics as well as varying powder loads in ammunition. The device includes a cylindrical-shaped main body with at least one surface opening. One end of the main body attaches to the muzzle; the main body can be rotated about the longitudinal axis of the muzzle. The device further includes a cap with a gas-restricting opening which attaches to the other end of the main body. This gas-restricting opening in the cap causes a portion of firing gases to back up and flow through the surface opening thereby causing force in the direction of the opening which serves to stabilize the muzzle. A preferred cap comprises a frustum-shaped portion which narrows towards the firearm.

Abstract: A muzzle brake device for a handgun comprises a housing disposed at the end of the barrel thereof, which includes a conical expansion chamber tapered outwardly from the barrel bore of the gun and connecting with a cylindrical passageway at the chamber's muzzle end. A strike plate having a truncated planar surface in the shape of the truncated planar surface of a hollow, annular, truncated cylinder, facing the breech end of the gun, is positioned in the passageway. A number of pressure port passageways communicating between the interior of the device, and the outside thereof, are provided to reduce muzzle rise and for other beneficial purposes.

Abstract: A debris shield/flash reducer for use in conjunction with attachments mounted on the muzzle end of a firearm barrel comprising a body member having a partial cylindrical configuration, a length adapted to extend along the attachments and a radius slightly greater than the radius of the attachment; a radially inwardly directed flange integrally formed with the body member at each end thereof for positioning the debris shield on the attachment, and attachment encircling means secured to the body member for securing the debris shield on the attachment.

Abstract: A compensator for a handgun comprises a barrel bushing having a first end inserted into the forward end of a slide and slidably receiving the barrel, and a second end projecting away from the barrel and slidably receiving a compensator weight having an external shape which conforms to and forms an extension of the slide. A bias spring mounted in the chamber beneath the barrel has a spring rod extending therethrough, the forward end of which projects into an opening in the lower end of the compensator weight. A projection on the barrel bushing retains a spring plug, slidably mounted on the spring rod, in a position to preload the spring and normaly urge the compensator weight toward the barrel. At least one threaded member provided in the compensator weight secures the compensator weight to the spring rod to prevent the compensator weight from experiencing either axial of rotational movement relative to the spring rod.

Abstract: A tripping mechanism is disclosed for the conversion of automatic rifles of the so-called closed-bolt type to rifles of the open-bolt type. The components of the mechanism are premounted within a box-like support which is readily insertable in the trip box of a conventional automatic rifle. The mechanism includes a trigger, a trip block for arresting the bolt carriage in the open, armed position, a connecting rod attached to and displaceable with the trigger and cooperating with the trip block during the disengagement of the bolt carriage from its blocked position, a safety bolt operating also as selector of the firing mode by cooperating with a lever, a lever for engaging the trigger during the automatic, continuous firing mode, and, finally, a safety block for arresting the bolt carriage in the event of accidental disengagement from the trip block.

Abstract: A compensator having an enlarged chamber is threaded onto the barrel of a handgun. The compensator has two equally sized, symmetrically positioned vertical upper ports aligned with matching ports in the threaded portion of the barrel, for vertically exhausting high pressure gas to produce a downward force that resists muzzle climb. The chamber also includes a pair of unequally sized, unsymmetrically positioned low pressure ports through which lower pressure gases are exhausted as the bullet leaves the chamber, compensating for rotation produced by the torque produced on the bullet by rifling of the barrel bore as the bullet accelerates.

Abstract: A muzzle stabilization arrangement for a rifle (10) with a barrel (14) includes a muzzle stabilizer (18) mounted on the front end of the barrel and having a transverse opening (80) partially defined by a surface (84) upon which propellant gases from the muzzle may impinge during firing to hold the muzzle down. Gas ports (38, 40) in the barrel supply propellant gas to orifices (62, 64) in the stabilizer which direct a gas screen over the opening to prevent excessive noise.

Abstract: A stabilizer, for firearms which fire a single projectile from each shell, which is attached to the muzzle of the firearm to control muzzle climb during firing. The stabilizer is adjustable in both the magnitude and direction of the forces which counter muzzle climb. The stabilizer is able to be adjusted for the individual characteristics of the firer as well as varying powder loads in ammunition. A body of the stabilizer is attachable to the muzzle of the firearm so that gas vent slots and gas screen ports may be oriented from the vertical in any desired direction. An adjustable nose cap is threaded into the body any desired portion of the length of the body and the nose cap may cover or expose any of the gas vent slots or a portion of one of the gas vent slots thus controlling the space through which escaping gases may escape, and consequently controlling the magnitude of the force countering the muzzle climb.

Abstract: Powder gases issuing from the muzzle of an aircraft-mounted gun are initially deflected to one side of the line of fire by a mouthpiece in the form of a length of pipe coaxially mounted directly in front of the muzzle and having an elliptical mouth extending all across it and along it from a pointy front end of it to a short distance in front of its rear end. The gases are further deflected to a discharge direction away from sensitive parts of the aircraft by a set of guide plates arranged outside the mouthpiece and spaced apart at regular intervals along the line of fire. Inner surface portions of the guide plates, proximal to the extended axis of the gun barrel, are parallel to the direction of local gas flow out of the mouthpiece, and the guide plates are curved so that their outer surface portions, which cooperate to define slot outlets, extend in said discharge direction and are parallel to one another.

Abstract: Conventional cannon and tank cannon frequently incorporate a muzzle brake device in order to reduce weapon recoil. Recently tank cannon have acquired the need to eject and disperse infrared (IR) signature masking aerosols, even when the weapon is muzzle brake equipped. The incorporation of an aerosol dispersal feature into a cannon is accomplished by the addition of metallic vortex generators, comprising blades or teeth that extend into the blast stream, to the muzzle brake.

Abstract: A muzzle brake for reducing swing, climb and recoil of a rifle is improved with a plurality of spaced ports intersecting the exit throat of the brake and venting gasses which would otherwise form an undesirable boundary layer effect. The effect of the ports is to prevent formation of the restricting boundary layer in the throat and to reduce the acceleration of gasses in the throat, thus reducing the flash effect of hot incandescent exit gasses.

Abstract: A machine pistol with means for retarding blowback of the slide assembly. The device has both right hand and left hand stocks to enable the weapon to be fired from a comfortable visual sighting position at eye level with the wrist axes perpendicular to one another. The slide assembly includes a bolt that carries the firing pin, extractor and ejector and that reciprocates relative to the receiver and barrel, and a tubular cylindrical muzzle sleeve removably connected to the forward end of the bolt and that fits coaxially around the barrel. A coaxial helical spring fits between the barrel and muzzle sleeve to urge the muzzle sleeve (and bolt) to the forward firing position wherein the forward end of the muzzle sleeve extends outwardly beyond the end of the barrel.

Abstract: A firing mechanism for a weapon having a receiver with a chamber for a caidge comprises a bolt and piston which are separately movable toward and away from the chamber and which are engaged with each other for displacing and rotating the bolt into a locked firing position. A buffer is also movable in the receiver and can strike the rear end of the piston. The piston carries a firing pin which can thus be driven into the primer of a cartridge in the chamber. Three sears are provided. Two of the sears are for engaging the piston, one sear for holding the piston in a position with its firing pin away from the cartridge but with the bolt against the chamber and in its locked position. The other sear for the piston holds the piston with the bolt in a position away from the chamber. This is for open bolt operation. A third sear is provided for engaging the buffer for closed bolt operation.