Abstract: A locking block is adapted to be mounted in a gun. The gun has a bias spring having a bias spring arm. The locking block includes two side bodies and a connecting body. The connecting body is connected between the two side bodies and has a bottom surface. The connecting body is formed with at least one positioning groove recessed upward from the bottom surface for catching the bias spring arm of the bias spring.

Abstract: The present invention relates to a firearm with a frame, a trigger, a barrel entrance, a cam, and a revolving cylinder configured a gap distance from the barrel entrance. The firearm may have a suppressor with a bullet pathway that ends in a muzzle and a gas exit pathway that ends in a gas exit. The suppressor may have at least one resonant chamber. When the trigger of the firearm is pulled, the cam may contact the frame and the revolving cylinder to eliminate the gap distance. When a bullet is fired from the firearm, gas may follow a projectile portion of the bullet. The gas may expand within the suppressor. The at least one resonant chamber may bias the gas away from the muzzle. The gas may exit the firearm via a muzzle or via a gas exit.

Abstract: A pistol may include a firing device arranged in a slide. The firing device includes a strikerhaving a striker head, characterized in that the device has at least two parallel striker springs arranged laterally on the side of the striker axis and bearing on at least two bearing surfaces arranged perpendicularly to the axis of the striker.

Abstract: An ammunition magazine includes a self-locking mechanism configured to prevent the magazine from being removed from a firearm without disassembly of the firearm action.

Abstract: A method for operating a semi-automatic firearm as a single-shot firearm comprising: installing a bolt in the firearm, wherein the bolt comprises a bolt lock safety device, wherein the bolt lock safety device extends beyond a face of the bolt when engaged preventing the firearm from automatically reloading; when the bolt lock safety device is engaged, pulling a charging handle back to cause the bolt to move rearward exposing the firearm chamber to reload a cartridge, wherein the adjustable bolt lock is simultaneously rotated by the lock pivot pin to lay flush with the bolt forcing the bolt back into forward position; and upon release of the charging handle, automatically reengaging the adjustable bolt lock via a lock return spring causing the adjustable bolt lock to extend beyond the face of the bolt.

Abstract: A weapon system that includes a breechblock, which is formed at least by a breechblock carrier and a breechblock head, the breechblock carrier being designed so as to carry the breechblock head. To achieve the fact that forces acting upon the breechblock drive during the unlocking of the breechblock and the withdrawal of a cartridge casing are minimized or even eliminated, the breechblock head is freely movable relative to the breechblock carrier. To separate the breechblock with a breechblock drive of the weapon system during the recoil of the recoiling masses of the weapon system, a device is designed in such a way that a mechanical separation takes place between the breechblock and the breechblock drive during the recoil of the recoiling masses of the weapon system. During the forward motion of the recoiling masses, the mechanical connection between the breechblock drive and the breechblock is reestablished via the device.

Abstract: A bolt carrier speed control apparatus that is configured to provide adjustable speed control of the bolt carrier during firing of a round of ammunition. The bolt carrier speed control apparatus is configured to be mounted in a first location or a second location. The bolt carrier speed control apparatus includes a body that is cylindrical in form. The body includes and interior volume and further includes a central bore extending longitudinally therethrough. Circumferentially disposed around the central core are a plurality of movement assemblies. The movement assemblies are configured to move in an inward-outward direction that is facilitated by traversal of an adjustment screw through the central bore. The movement assemblies include a wall engagement member that is configured to extend beyond the external surface of the body so as to engage a portion of the firearm and provide speed control of the bolt carrier through added friction.

Abstract: A firearm having reduced recoil including a front slide connected to a rear slide by way of a slide link. Firing the firearm causes the rear slide to recoil and transfer energy, by means of the slide link, to the front slide. The front slide moving in the direction opposite the rear slide thereby reducing the recoil of the firearm. After reaching full recoil, the front and rear slides return to their resting positions.

Abstract: A method of modifying a rifles of the M16, M4, AR15 platform provides a second bolt stop release operable from the right side of the rifle. The second bolt stop release is a rigid extension of the bolt stop that passes through the right receiver wall to a position accessible to a user gripping the rifle with the user's right hand in conventional firing position. The two bolt stop releases provide the inventive rifle ambidextrous bolt release operation.

Abstract: Embodiments of the present invention provide firearm receiver with ambidextrous features. Some of these features include a bolt-locking mechanism on a firearm receiver that is configured to allow an operator to clear jams while maintaining hold of a firing grip. The bolt-locking mechanism may include a linking mechanism configured to manipulate a bolt-catch device in response to activation of a magazine release button on a firearm receiver. Other features include an ambidextrous magazine release mechanism on a firearm receiver that is configured to allow an operator to release an inserted magazine while maintaining hold of a firing grip with either hand. The magazine release mechanism may include a linking mechanism configured to manipulate a magazine catch device in response to activation of either a right-handed magazine release button or a left-handed magazine release lever that pivots on an external fulcrum on a firearm receiver.

Abstract: A firearm having reduced recoil including a front slide connected to a rear slide by way of a slide link. Firing the firearm causes the rear slide to recoil and transfer energy, by means of the slide link, to the front slide. The front slide moving in the direction opposite the rear slide thereby reducing the recoil of the firearm. After reaching full recoil, the front and rear slides return to their resting positions.

Abstract: The mechanism comprises a main frame (1) and its extension (1?), which accommodate a barrel (21) with fixed mounting, a mobile bolt (22) and its guiding pin ensemble (66) and main spring (67) moving in the main frame (1), a mobile mass (34) and its assembly of guiding pin (60), push plate (61) and return spring (62), and a mobile mass catch sear (42) and its spring (7). The mobile mass pivots from a first position under the barrel to a downward position in reaction to the backward movement of the mobile bolt. The placement of the mobile mass in front of the chamber directs counteracting forces down on the barrel to prevent muzzle climb during operation.

Abstract: A firearm has a frame, a slide mounted to the frame, a trigger, a hammer-type firing mechanism including a hammer, and a manual slide and hammer lock safety mechanism (“manual safety”) including a detent spring biased rotatable tab mounted to the frame that blocks the slide from reciprocating and the hammer from rotating relative to the frame if the tab is actuated in an “on” position. The manual safety completely disables the firearm even if the trigger is actuated, thereby rendering the firearm safer.

Abstract: The invention comprises an improved recoil control device comprising a bolt head and an inertia block for use in a variety of firearms. In one embodiment, the bolt head and inertia block are articulated so that the displacement of the bolt head results in a force component outside the firing axis of the barrel of the firearm. The device can be incorporated into firearms of a variety of sizes and configurations to produce recoil reduction and/or weight reduction advantages.

Abstract: An ambidextrous bolt stop for use with a firearm generally includes a first bolt stop element having a bolt stop finger and a first release lever operatively connected to a left side of a receiver of the firearm and a second bolt stop element having a second release lever operatively connected to a right side of the firearm. The second bolt stop element engages the first bolt stop element via a yoke and pin type configuration interior to the receiver of the firearm. The first and second release levers include first and second buttons located exterior to the receiver on respective sides thereof to actuate the bolt stop.

Abstract: The invention relates to a breech for a repeating rifle with a lock guide, a bolt head arranged in the lock guide, a locking sleeve arranged concentrically with the bolt head with several locking elements that can be moved by an expansion device between an inner unlocked position and an outer locked position, and a locking lever that is arranged in the lock guide and that can be activated by means of a bolt handle with which is associated a first cam element that is arranged so that it can rotate in the lock guide with a rear contact surface for support against a fixed control element. To allow especially smooth-running and safe locking action, a second cam element, which can rotate independently of the first cam element and that has a rear control cam for support against the fixed control element is associated with the locking lever.

Abstract: A firearm formed by a housing, in which an assembly of a carriage and a barrel with a muzzle brake, and a breech block are slidingly supported, wherein the breech block is equipped with a return spring that is supported on a rear support surface of the housing, has a counter weight slidingly disposed in a longitudinal space located between the housing and the carriage and has a support surface which leans against a rear end of the return spring, the said counter weight being seated in its front position on a front stop surface of the carriage.

Abstract: An automatic pistol essentially consists of an immovable barrel, a breech with a firing pin and a cartridge extractor, a breech frame, a spring-loaded device for the removal of gas with a gas piston and a gas cylinder, a firing mechanism and a magazine. The barrel is fitted with an end piece, which is located in the lower part of the rear end of the barrel. The design of the breech allows for the displacement of its front part downwards, when the breech is in its front end position. The front part of the breech is fitted with side locking lugs. The corresponding locking grooves are located in the cavities on the end piece of the barrel. The gas piston has an opening for ejecting the cartridge casing. In the course of the backward movement, the gas piston unlocks the breech and draws it back. In the forward movement, the breech is carried forward and pushed downwards. The gas cylinder is located at the front part of the barrel and encompasses the barrel. Along the length of the barrel gas ducts are fixed.

Abstract: The mechanism comprises a main frame (1) and its extension (1?), which accommodate a barrel (21) with fixed mounting, a mobile bolt (22) and its guiding pin ensemble (66) and main spring (67) moving in the main frame (1), a mobile mass (34) and its assembly of guiding pin (60), push plate (61) and return spring (62), and a mobile mass catch sear (42) and its spring (7). The mobile mass pivots from a first position under the barrel to a downward position in reaction to the backward movement of the mobile bolt. The placement of the mobile mass in front of the chamber directs counteracting forces down on the barrel to prevent muzzle climb during operation.

Abstract: A semiautomatic rifle has a housing defining a housing axis and containing a bolt assembly that reciprocates along the housing axis. The bolt assembly has a bolt carrier and a bolt, which reciprocates axially with respect to the carrier. A barrel is connected to the housing, and has a rear portion having a locking chamber that removably receives part of the bolt. An arm element interconnects the bolt carrier and the bolt, and operates to extend the bolt in response to rearward movement of the bolt carrier within the housing. The arm may be pivotally connected to the bolt carrier. The bolt may include a rod external of the bolt carrier, having a rear end contacting the arm, and a forward end contacting the rear of the barrel.

Abstract: A bolt head locking arrangement for a recoil operated weapon where projectile is expelled by discharging a cartridge. The weapon comprising an action body, a barrel, and a bolt assembly, the bolt assembly being slidable within the action body. The bolt assembly comprising a bolt head, a locking slide and a firing pin, and a locking means arranged so that, upon loading a new cartridge for discharging, the locking means positively lock the bolt head such that, for a predetermined amount of time after the loaded cartridge is discharged, the locked bolt head stops the cartridge from retreating into the action body. The locking means is substantially in an in-line configuration with the bolt assembly.

Abstract: A handgun, particularly an automatic pistol, with a grip piece, a breech that can be longitudinally displaced relative to the grip piece, and a breechblock mechanism that can be actuated on both sides and serves for holding the breech in its open position. The breechblock mechanism has a breechblock lever that is realized in the form of a one-piece punched and bent part and has two lateral parts that are integrally connected to one another by a crosspiece, as well as operating parts that are integrally connected to the respective lateral parts.

Abstract: A bolt locking assembly for a weapon simulator, the weapon simulator having a bolt affixed to a firearm housing providing recoil to the user. The bolt is connected to a piston housed in a piston chamber inside the housing. A gas supply provides a compressed gas or fluid into the piston chamber to generate movement and recoil of the piston. After the weapon simulator has been fired a predetermined number of times, the bolt locking assembly will obstruct operation of the bolt and piston. The bolt locking assembly includes a lock actuator port engaging the piston chamber, a locking apparatus positioned within the housing proximate the bolt, and a lock channel between said lock actuator port and said locking arm, wherein the lock channel directs gas to said locking apparatus to actuate said locking apparatus and fix the bolt in place.

Abstract: A firearm having a slide includes a magazine for accommodating a round of ammunition and a magazine follower disposed within the magazine. The magazine follower supports the round of ammunition and includes an outwardly extending protruding lip having a distal end which extends beyond a plane defined by an outer wall of the magazine.

Abstract: A bolt locking assembly for a weapon simulator, the weapon simulator having a bolt affixed to a firearm housing providing recoil to the user. The bolt is connected to a piston housed in a piston chamber inside the housing. A gas supply provides a compressed gas or fluid into the piston chamber to generate movement and recoil of the piston. After the weapon simulator has been fired a predetermined number of times, the bolt locking assembly will obstruct operation of the bolt and piston. The bolt locking assembly includes a lock actuator port engaging the piston chamber, a locking apparatus positioned within the housing proximate the bolt, and a lock channel between said lock actuator port and said locking arm, wherein the lock channel directs gas to said locking apparatus to actuate said locking apparatus and fix the bolt in place.

Abstract: An improved bolt action rifle. In its preferred embodiment, the improved bolt action rifle has at least one locking lug positioned within the bolt and having at its bottom a convex projection adapted to be inserted into a mating convex slot; a locking lug safety plunger located adjacent to a locking lug and adapted to prevent full insertion of the bolt without the presence of the locking lug; a bolt handle lock to lock the bolt in an upright position when the bolt handle is pulled rearward of the receiver; a bolt handle positioning detent to hold the bolt in a downward firing position when the rifle is in condition to be fired; a split receiver ring having two openings, one for permitting the ejection of a cartridge and the other for permitting the insertion of a new cartridge from the magazine; a bolt sleeve lock for locking together portions of the bolt; an ambidextrous magazine release; a magazine ejector; and an improved trigger mechanism based on the use of studs instead of pins.

Abstract: Operating method of automatic fire-arms and automatic revolver based on this method. The operation method involves turning the arm barrel unit in a vertical plane relative to a transversal horizontal axle connecting the arm barrel unit with the frame occurring as a result of action of the arm of force. The automatic revolver contains the barrel unit with the cylinder connected with the frame by the transversal axle, a grip and the slide is located in the barrel unit. The slide includes a slide retainer, slide accelerator, mechanism for translational-rotational movement of the slide and an engagement unit for causing engagement between fired cartridge-case bottom the slide cup. The arm kickback compensator is located inside the grip in a cavity and includes a retainer movably fastened to a rear wall of an upper part of the grip defining the cavity. The technical result of the method and automatic revolver is the elimination of the negative influence of the arm of force occurred in shooting.

Abstract: Breechblock for automatic or semi-automatic weapons provided with fixed barrel and burst-box integral with to the barrel, wherein the breechblock is provided with adjustable elastic means capable of opposing the initial displacement of the breechblock in respect of the burst-box at the moment of the firing.

Abstract: Repeating gun having an actuating arrangement which is mounted so as to be axially displaceable and which can be connected to a movable breech mechanism, which is guided likewise in an axial manner, for opening and closing the cartridge chamber, and can be locked by way of safety means, wherein the actuating arrangement is formed as an axially movable pistol grip (2) having a trigger guard (6), which frames a stationarily mounted trigger (5), and is connected to the breech mechanism (1) by way of two guide bars which are formed as L-shaped strips (3) and which slide in grooves on both sides of the axis of the barrel and are anchored with their shorter ends on the breech mechanism (1) as well as with their longer ends on the pistol grip (2) or the trigger guard (6) respectively, and in that the safety means comprise a spring-loaded press button (7) which is provided on the rear projection of the pistol grip (2) and by way of which the repeating unit is locked in the closed position of the breech mechanism and

Abstract: A breechblock system for a gun includes a breechblock; a firing pin slidably received in the breechblock and having two diametrically oppositely located catch recesses; and two locking levers pivotally supported by the breechblock on opposite sides thereof and each having first and second arms. The two locking levers have a locking position and an unlocking position. In the locking position the first arm of the respective locking levers projects into the respective catch recesses for preventing the firing pin from moving from its locked position into its firing position. Further, two bolts are provided which are movably supported on opposite sides of the breechblock and which cooperate with the breechblock and with respective locking levers. The bolts have a withdrawn position and an advanced position. In the withdrawn position the bolts are out of a depressing engagement with the respective locking levers, whereby the locking levers are maintained in the locking position by a force-exerting arrangement.

Abstract: A known gas operated firearm has been modified to be of more compact size and reduced weight while retaining the firepower, the features, and most of the components of its predecessor. A bolt assembly reciprocably mounted in a longitudinal cavity of a receiver assembly for movement between recoil and battery positions has a forwardly facing pressure surface and first and second longitudinally extending coaxial bores. The annular flange of a firing pin is slidable in the second bore and the bolt assembly includes a transversely extending retaining pin engageable by the annular flange to define an aftward terminal position of the firing pin. A recoil assembly includes a pair of tungsten weights mounted in the longitudinal cavity for rectilinear movement with the bolt assembly between the recoil and battery positions and includes means to bias the bolt assembly toward the battery position.

Abstract: An autoloading firearm having a reciprocating bolt, a cocking lever and firing pin which bolt and firing pin are locked by a locking lever until the trigger is pulled or until the cocking lever of the bolt is manually pulled back. A linkage operably controlled by the trigger causes the locking lever to unlock the bolt and firing pin when the trigger is pulled.

Abstract: A gun 10, such as a shot gun or the like, of the type which includes a firing pin carrying bolt 25 which is reciprocally movable relative to the firing chamber 23 of the gun 10 between a first or firing position where the firing pin 29 can engage the rear end of a cartridge 22 located in the firing chamber 23 of the gun 10, to a second or reload position located towards the rear end of the gun 10, the gun 10 being characterised in that it includes at least two locks for positively maintaining the bolt the firing position while and after a shot has been fired and before the gun is reloaded, the locks comprising a first one 39 located rearwardly of and at a level above the firing chamber 23 of the gun 10, and at least one of two further locks, the second one 51 located at a level below and in a position forward of the firing chamber 23, and a third one 77 located at a level below and in a position rearwardly of the firing chamber 23.

Abstract: In the breech mechanism for a firearm the receiver (2) attached to the barrel has a radially inwardly directed conical locking shoulder (16). A breech head (9) and a locking sleeve (7) are arranged in a slider (3) slidable relative to the breech housing (1) in the barrel direction. The locking sleeve (7) is divided into a plurality of spring tongues (7b), each of which carries a locking element (13) with radially inwardly and outwardly directed cone sections. A spreading cone is arranged in the vicinity of the front end (9a) of the breech head (9) and cooperates with the locking elements (13). An actuating lever (18) is arranged on the slider, connected to a pivot shaft (17). The pivot shaft (17) is connected to a locking lever (19). A two-armed intermediate lever (20) is pivotally mounted on the slider (3) behind the locking lever (19), pivoting about an axis (20a) parallel to the pivot shaft (17) and cooperating with an abutment (22) arranged on the breech housing (1).

Abstract: A breech lock mechanism for automatic firearms, in particular, a rigidly closing breech lock mechanism with loosely located support flaps in its breech head which will slide along an associated and complementary formed latching and unlatching component into its rearward latching position during the opening of the breech lock mechanism. The surfaces of the support flaps which face towards the latching and unlatching component are at least partly provided with a lubricating layer whose hardness is different with respect to the complementary latching and unlatching component.

Abstract: The safety lock for a barrel of automatic weapons comprises a breechblock carrier whose face facing the barrel confronts a slide. This slide is movable essentially perpendicular to the longitudinal axis of the barrel into a recess provided in the outside surface of the barrel, if the barrel is correctly locked.

Abstract: A gun mechanism for guns embodying safety mechanism. The mechansim includes a trigger, a sear, and a hammer in operative relationship. A disconnector member is carried by the trigger and is operative to disconnect the sear from the hammer for firing. An extending member extends from the bolt carrier to a position over the trigger mechanism. A link member is positioned between the extending member and the disconnector member and is operative to hold the disconnector member in an inactive position, that is, a safe position at all times unless the said extending member is in a fully forward closed and locked position of the bolt. A bolt carrier has a limited sliding relationship with the bolt which includes a bolt locking member. The carrier undergoes an initial movement before the bolt moves which operates the link member to the safe position, after which the bolt is unlocked for movement. Positive safety is provided in that the disconnector member is held inactive unless the bolt is fully closed and locked.

Abstract: A firearm comprises a barrel having a bore and a receiver forming an ignition chamber. A bolt is slidable in the ignition chamber and includes a striker projection for igniting a primer of the projectile. A bolt advancing mechanism comprises an arm having a first end mounted on the bolt such that a second end of the arm is movable laterally relative to the fore-aft axis. A boss is carried at the second end of the arm. An actuator member is movable in the fore-aft direction relative to the bolt and boss, and includes a first cam surface inclined relative to the fore-aft axis for urging the boss forwardly and laterally. The boss is movable laterally along the first cam surface in response to the boss becoming aligned with a lateral groove in the receiver. Such lateral movement of the boss is in a direction tending to displace the bolt forwardly.

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: An apparatus for the lubrication of the locking bolts of a breechblock of an automatic firing weapon enables, with very little maintenance, reliable lubrication of the locking bolts. The lubrication apparatus contains a hydraulically loaded supply container, a hydraulically actuatable dosing device, and a hydraulically releaseable or unlockable check or non-return valve, in order to spray or otherwise apply a lubricant by means of spray or injection nozzles upon the locking bolts within a breechblock housing.

Abstract: A gas operated system for use in semiautomatic firearms is disclosed. The gas operated system utilizes a gas powered assembly which is actuated by gas under pressure. The gas powered assembly is utilized to provide rearward motion to a drive assembly. The drive assembly has a rod associated therewith which engages unlocking structure so that this structure unlocks locking structure so that the bolt assembly can move rearwardly from the battery position. Movement of the bolt assembly rearwardly is accomplished principally due to expanding gas present in the barrel of the firearm which acts against the face of the bolt assembly.

Abstract: A recoil brake or block mechanism for an automatic fire arm having a linearly reciprocating breech block. This mechanism includes a slide which is reciprocally mounted on the breech block. A two-armed lever is pivotally mounted in the housing of the fire arm and is adapted to coact with the slide so as to absorb a portion of the recoil energy. The slide has front and rear contacting surfaces and the two-armed lever has a pair of arms, each of which has a control surface which is adapted to respectively coact with one of said contacting surfaces. The center of gravity of the two-armed lever is located in the longer arm of the two-armed lever at a distance from its pivot support.

Abstract: A feature of this invention is the provision of a gun bolt having a firing pin which is movable to and between an aft disposition whereat the forward end of said pin is aft of the face of the gun bolt and a forward disposition whereat said forward end is forward of said face, locking means movable to and between a locked disposition whereat said gun bolt is locked to fixedly close the chamber of the gun and an unlocked disposition, and intermediate means responsive to the disposition of said locking means for locking said pin in its aft disposition when said locking means is not in its locked disposition.

Abstract: A firing pin block for a firearm of the type having a reciprocating bolt assembly including a breech bolt and slide block, a firing pin, and a pivotal locking block. The slide block and locking block have cam means which cooperate to pivot the locking block in and out of locking engagement with a recess in the barrel as the slide block is reciprocated to close and open the bolt. The operation of these cam means is coordinated with relative longitudinal displacements between the bolt and slide block so that, at any time the locking block is not completely locked, the slide block prevents sufficient forward movement of an abutment on the firing pin to cause the firearm to discharge. This firing pin block is effective even though the firing pin spring and retaining pin may be broken, distorted, or missing.

Abstract: Device for controlling the degree of blowback delay in automatically operable weapons is provided and comprises locking means which are operable to prevent opening of the weapon breech until breech pressures have dropped to generally residual, safe levels. For use with automatically operable pistols the device takes the form of a hammerlock which locks the hammer to the slide, and for use with automatically operable long guns the device takes the form of a boltlock which locks the bolt to the receiver.

Abstract: A breechblock for an automatic firing weapon wherein at the breechblock having a control element and a breechblock head which can be locked at the breechblock housing the locking elements are specially designed. At a front part of each locking element containing the pivot axis of such locking element there is provided a locking surface and at a rear shoulder or projection of each locking element there is provided a support surface beneath which there can engage the control element. Since the locking surface is disposed forwardly with respect to the end of the support surface the path of movement of the breechblock is shortened, and thus, the firing cadence or speed is increased. Furthermore, at the locking elements there are present more favorable force conditions.

Abstract: Anti-bounce apparatus for an automatic cannon reciprocating bolt assembly which includes a bolt, a bolt carrier and bolt mounted locking lugs, comprises means defining engagement surfaces contoured for enabling the forward moving carrier to cam the lugs into bolt locking relationship with a cannon breech at increasing velocity, without bouncing, carrier energy loss being thereby minimized and firing of a chambered shell by a carrier mounted firing pin being assured. Further comprising the anti-bounce apparatus is a plurality of inertially actuated locking collets connected to the bolt carrier for causing, responsive to impact of the carrier with the breech at the instant of firing, frictional locking between the carrier and portions of the cannon fixed to the breech, rearward bouncing of the carrier relative to the locking lugs, with consequent premature or erratic bolt unlocking, being thereby prevented.

Abstract: A breechblock for an automatic firing weapon comprising a breechblock housing having a bore in which there is connected a weapon barrel,a breechblock body is displaceably arranged in the breechblock housing. The breechblock body is equipped with at least one blocking body by means of which the breechblock body can be locked with the breechblock housing. The blocking body bears against a rest or arresting surface of a locking body inserted into the breechblock housing. The locking body is of substantially sleeve-shaped configuration and is equipped at its rear end with a cut-out or notch extending transversely with respect to the lengthwise axis of the weapon, the side walls of which form the arresting surfaces. The locking body is arranged coaxially to the weapon barrel in the aforementioned bore of the breechblock housing, and it bears with its rear end surface at a shoulder of the breechblock housing and at a rear end surface of the weapon barrel.

Abstract: In a magazine-fed firearm having its barrel fixed to the frame and having a slide reciprocably mounted to the frame, with resilient means positioned between the slide and the frame urging the slide toward the muzzle, a lever rotatably mounted to the frame releasably engages notches formed in the slide, delaying opening of the breech momentarily after each firing to allow the internal gas pressure to reach a safe level, and retaining the slide with the breech open to signal the firing of the last cartridge. A resiliently biased plunger on the frame restrains the lever against rotation into and out of engagement with the notches.

Abstract: A breechblock assembly and operating mechanism for a gas operating automatic loading fire-arm has a breechblock slider adapted to be retracted by utilization of a gas pressure at the firing of the shotshell, a link is pivoted at the rear end of the slider so as to be swingable up and down and provided with swinging-movement limiting means, a breechblock is adapted to be locked so as to tightly close the breech face of the barrel and is mounted on the breechblock slider so as to be forwardly movable for a predetermined length, and a propelling force recoil spring mechanism engages the rear end of the link and is located in the stock of the gun for energizing the link to guide the tilting backward movement thereof, and the actuating mechanism is so constructed that it releases the limitation of the swinging-movement of the link when the breechblock slider and the breechblock are relatively moved by a predetermined length from their initial positions.