Abstract: An operating system for a firearm includes a forward bolt includes a forward bolt cavity, a carrier disposed on a rear side of the forward bolt, the carrier including a carrier cavity, a short cam pin including (i) a forward section that is at least partially disposed within the forward bolt cavity and (ii) a rear section that is at least partially disposed within the carrier cavity, a plurality of bearings that interface with the forward bolt, a retracted configuration where the short cam pin is in a rear position relative to the forward bolt, and a deployed configuration where the short cam pin is in a forward position relative to the forward bolt.

Abstract: A bolt carrier group assembly for a firearm includes at least one metallic bolt carrier group component with an outer metallic surface and at least one insert with an outer surface. The outer surface is at least flush with the outer metallic surface, and the at least one insert has a lower coefficient of friction compared to the at least one metallic bolt carrier group component.

Abstract: A firearm which is modifiable by the user such that a firearm barrel is arranged replaceable by the user, wherein the firearm comprises a barrel unit, which is detachable by the user and fastenable to a receiver, which barrel unit comprises the barrel and a locking piece, wherein the locking piece has a backward narrowing rear cone, which fits a cone in the receiver and which has a forward narrowing front cone, and which fits a cone in the centering bush, wherein to the centering bush is rotatably connected a clamping bush having an outer thread which fits an inner thread in the receiver, wherein by rotating the clamping bush in the locked direction, the rear end of the locking piece is centerable by means of the rear cone and lockable to the cone in the receiver.

Abstract: Rotary lug breeches and weapons including such rotary lug breeches are disclosed. An example rotary lug breech includes a bolt carrier. Wherein when releasing the bolt, a cam section of a receiver converts a releasing motion into a screwing motion to release a cartridge. During the screwing motion, a first stud surface interacts with the cam section. During a locking process, the first stud surface engages the cam section to perform a pre-control process that rotates a control pin in a slot from a releasing position in which an advancement of the bolt carrier exerts substantially no torque on the bolt, to a control position in which a first slot surface of the slot interacts with the control pin. When the bolt carrier moves forward, the bolt carrier exerts a torque on the bolt to enable the bolt and the bolt carrier move relative to one another.

Abstract: A semiautomatic firearm and firearm firing mechanism includes a bolt assembly having a bolt body coupled to a locking head for imparting a dwell in the sequence or process of bullet casing ejection, reloading, and re-cocking sequence during firing of the firearm. The locking head and bolt body rotate relative to one another as they translate longitudinally relative to one another, owing to corresponding engagement members. The locking head includes an additional engaging member for engagement with a corresponding engaging member along an inner surface of a fire control housing that houses the firing mechanism, so that the rotation and longitudinal translations of the locking head are performed in a controlled manner, which further controls the movement of the locking head and the bolt body relative to one another. A striker is released by a sear, which is coupled to a trigger, to initiate the firing and reloading/re-cocking sequence.

Abstract: A semiautomatic firearm and firearm firing mechanism includes a bolt assembly having a bolt body coupled to a locking head for imparting a dwell in the sequence or process of bullet casing ejection, reloading, and re-cocking sequence during firing of the firearm. The locking head and bolt body rotate relative to one another as they translate longitudinally relative to one another, owing to corresponding engagement members. The locking head includes an additional engaging member for engagement with a corresponding engaging member along an inner surface of a fire control housing that houses the firing mechanism, so that the rotation and longitudinal translations of the locking head are performed in a controlled manner, which further controls the movement of the locking head and the bolt body relative to one another. A striker is released by a sear, which is coupled to a trigger, to initiate the firing and reloading/re-cocking sequence.

Abstract: A locking and recocking assembly with swivel breech-lock and rotating locking head particularly designed for inertially-actuated weapons, which combines in a single assembly all the functions for locking, opening, case ejection and recocking with locking return, required for correct operation of the weapon; those functions were, until now assigned to various components variously assembled on the weapon. The locking and recocking assembly with swivel breech-lock and rotating locking head has the entire mass, required for inertial operation, concentrated in the swivel breech-lock, which is accommodated completely within the supporting structure of the weapon, such as the sheath or barrel extension or breech of the weapon. All this leads to better balancing and stability of the weapon, higher reliability in operation, greater constructive simplicity and ease of assembly and disassembly.

Abstract: A bolt used in a self loading firearm employing a bolt carrier which in turn carries the bolt. The bolt includes a cam pin receptacle and a cam pin carried by the bolt. The cam pin includes a body having a received end and an exposed end. The received end is received in the cam pin receptacle with the exposed end extending outwardly from a surface of the bolt. A roller is rotatably coupled to the exposed end and rotatable around an axis of the body.

Abstract: A method and apparatus providing an action system for a semi-automatic shotgun including a receiver having an ejection port for expelling an empty cartridge of a fired projectile. The action system includes a bolt attached to a bolt carrier, wherein the bolt and the bolt carrier are movable within the receiver and substantially parallel to a longitudinal axis. A surface is attached to at least the bolt carrier or the receiver, and a roller is positioned rearward of the ejection port and proximate the surface, wherein a resistance is provided to rearward movement of at least the bolt or bolt carrier.

Abstract: A method and apparatus providing an action system for a semi-automatic shotgun including a receiver having an ejection port for expelling an empty cartridge of a fired projectile. The action system includes a bolt attached to a bolt carrier, wherein the bolt and the bolt carrier are movable within the receiver and substantially parallel to a longitudinal axis. A surface is attached to at least the bolt carrier or the receiver, and a roller is positioned rearward of the ejection port and proximate the surface, wherein a resistance is provided to rearward movement of at least the bolt or bolt carrier.

Abstract: Methods and apparatus are disclosed for a locked machine gun that includes a casing, a barrel, a locking breech mechanism, an abutment and a quick change attachment. The locking breech mechanism has at least one locking body. The abutment holds the locking body or locking bodies of the locked breech mechanism. The quick-change attachment is used to facilitate the removal of the barrel and insertion and attachment of a new barrel. A first part of the abutment remains on the casing when the barrel is being changed, and a second part of the abutment is firmly connected to the barrel. The quick-change attachment is equipped to bring about a separation between the first part of the abutment remaining with the casing and the barrel with the second part. Also, the second part of the abutment has a curved section which controls the engagement of the breech mechanism in the abutment when the breech mechanism closes.

Abstract: A contact safety device between two mechanical parts mobile which respect to one another to guarantee the internal kinematics, by the release or activation of control means, wherein said device incorporates a safety unit connected to one of said two mechanical parts enclosing a probe activated by one of said two mechanical part and amplifying means constituted by an amplifying lever activated by said probe and an immobilizing lock activated by said amplifying lever meshed on said control means so as to transform a rectilinear micro-movement into a circular movement of large magnitude.

Abstract: A method and apparatus providing an action system for a firearm. The action system includes a primary roller-lock mechanism located rearward of an ejection port. The primary roller-lock mechanism includes a bolt and a first primary roller caged within the bolt. A bolt carrier ramp is attached to a bolt carrier. A barrel extension ramp is attached to a barrel extension. The first primary roller, bolt carrier ramp, and barrel extension ramp cooperate to effectively delay movement of the bolt and bolt carrier in response to firing of the firearm.

Abstract: A locking system for firearms including a locking ring rotatably mounted to a bolt. As the bolt is moved through a bolt slide, the locking ring engages a cam member, which causes the locking ring to rotate about the bolt, which can remain fixed against rotation.

Abstract: A locking system for firearms including a locking ring rotatably mounted to a bolt. As the bolt is moved through a bolt slide, the locking ring engages a cam member, which causes the locking ring to rotate about the bolt, which can remain fixed against rotation.

Abstract: A breech device for bolt-action firearms includes a breech body reciprocating in the receiver and rotatable into locking position. In its front part, the breech body has locking lugs located in three sectors, the locking lugs in at least two sectors being formed in a breech device equipped with a magazine loaded in parallel so that there are four guide surfaces to limit rotation between the receiver and the breech body, and the breech body has a recessed locking surface for the cartridge at its end. The locking surface of the cartridge has been extended downwardly to form a glide surface passing between the locking lugs so that the rear surface of the cartridge case slides on the glide surface and the locking surface into locking position as the cartridge is ejected from the magazine into the cartridge housing.

Abstract: A gas operated action for auto-loading guns may comprise a receiver, a biasing spring, a bolt-carrier reciprocable within the receiver, a bolt having a cam pin, and an action rod fixedly attached to the receiver. The cam pin may engage the action rod during recoil travel of the bolt and bolt-carrier, thereby preventing rotation of the bolt when the cam pin is engaged with the action rod.

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 apparatus for loading a cartridge into a cartridge chamber of a firearm is provided. The apparatus includes a barrel, and a bolt assembly mounted for movement from a rear position to a forward position to advance a cartridge into the cartridge chamber. The bolt assembly includes a center axis which is not in coaxial alignment with the center axis of the barrel when the bolt assembly is in the rear position. The bolt assembly further includes a bolt head defining a percussion recess. The percussion recess is dimensioned to receive a proximal end of the cartridge with clearance to permit transverse movement of the proximal end of the cartridge relative to the percussion base. The firearm also includes a locking piece adjacent the cartridge chamber for centering the bolt head as the bolt assembly moves from the rear position toward the forward position such that the center axis of the bolt assembly is substantially coaxially aligned with the center axis of the barrel.

Abstract: The present invention is a modified bolt assembly and firing mechanism for creating a replica MG 34 Mauser rifle. The present invention provides for an MG 34 replica which fires from a closed bolt firing weapon, and is capable of only semi-automatic operation. The modified bolt assembly and firing mechanism of the present invention include design elements that deter conversion of the semi-automatic MG 34 Mauser rifle replica into a fully automatic weapon.

Abstract: A firearm having a safety device known as a Detachable Firing Assembly. This removable section of a firearm houses the firing hammer and is instantly removed to completely disable a firearm and is to kept in a location other than the firearm itself.

Abstract: A telescopic breech bolt and breech bolt receiver for a closed bolt firing delayed blowback automatic firearm featuring, a thumbwheel operated rotating safety device which, locks the firing pin and the breech bolt with one single action.

Abstract: An improved bolt, bolt carrier and barrel assembly for rifles is described. This invention provides bolt mechanism that has heavier lugs on each side of the extractor to distribute the forces more equally and reliably and thereby reducing firearm failure rate. Moreover, this invention provides a bolt system that is easily adaptable to different ammunition feed devices as well as different ammunition cartridges. This invention further includes a barrel having a barrel extension designed to mate to the symmetrical bolt head lugs of this invention.

Abstract: A two-barrel gun for firing two types of ammunition includes a single breech locking mechanism for both barrels. The gun includes a selector lever for activating one of two bolts associated with the two barrels, and a single trigger for firing ammunition from a chamber associated with the activated bolt. The gun further includes two magazines for feeding ammunition to the chambers, and a pump-action forearm for ejecting spent ammunition and for loading a new round of ammunition into the chamber associated with the activated bolt. The single breech locking mechanism extends forwardly of the chambers, and the actual breech locking engagement occurs in front of the bolts. Therefore, the receiver section of the gun can be made more compact, and can more easily accommodate other essential components.

Abstract: Straight-pull breechblock (20) with rotating-boss locking mechanism for repeating weapons, having a breechblock head (27) which is guided in a longitudinally and rotationally movable manner in a breechblock housing (22) and has locking bosses (42, 43), and having a breechblock sleeve (24) which carries a bolt handle (28) and in which is mounted a firing pin (23) which is acted upon by a firing spring (53), for the movement of the breechblock head (27) in the longitudinal direction, while the rotational movement thereof is forced by way of the pretension of the firing spring (53) which acts on the firing pin (23), wherein by way of a forcibly controlled spring-mounted stopping lever (58) associated with the breechblock sleeve (24), relative movements between the breechblock head (27) and the breechblock sleeve (24) can be prevented until the breechblock head (27) has gone into the region of the locking chamber (44) of the breechblock housing (22).

Abstract: A two-barrel gun for firing two types of ammunition includes a single breech locking mechanism for both barrels. The gun includes a selector lever for activating one of two bolts associated with the two barrels, and a single trigger for firing ammunition from a chamber associated with the activated bolt. The gun further includes two magazines for feeding ammunition to the chambers, and a pump-action forearm for ejecting spent ammunition and for loading a new round of ammunition into the chamber associated with the activated bolt. The single breech locking mechanism extends forwardly of the chambers, and the actual breech locking engagement occurs in front of the bolts. Therefore, the receiver section of the gun can be made more compact, and can more easily accommodate other essential components.

Abstract: A firearm, in particular a hand firearm is proposed having a displaceable barrel (23) and a locking mechanism between a bolt carriage (22) accepting the barrel and a guide rod (26) coupled to the barrel (23), wherein the unlocking is effected through rotation of this guide rod (26)

Abstract: A sleeve made of spring plate is positioned between the mushroom head and the breechblock carrier of a locked firearm. The sleeve is supported in the expanded state between the mushroom head and the breechblock carrier and, thus, prevents their being pushed together. During closure of the breechblock, the sleeve enters a fixed cone which compresses it radially in elastic fashion so that the sleeve can be inserted into an annular space in the mushroom head and/or the breechblock carrier. The radial compression of the sleeve permits the mushroom head and the breechblock carrier to be pushed together and, thus, permits relative rotation between the mushroom head and the breechblock carrier.

Abstract: Reliability of a multi-lug breech bolt is improved by modifying the bearing relationship between the bolt lugs and the matching lugs within a gun receiver. This procedure is applied to a gun that has a receiver housing a breech bolt and an extractor. The extractor is coupled to the breech bolt and configured to move relative thereto. The bolt for this gun has at least five radially extending bolt lugs configured for bearing contact with the receiver when positioned for firing. The bolt lugs include a first, second, and third bolt lug with the first and second bolt lugs being adjacent and defining a gap configured to receive the extractor therebetween. The third bolt lug extends from the bolt opposite the gap. Stress imparted to the first and second bolt lugs from firing the gun is reduced by altering the gun to prevent formation of a bearing relationship between the third bolt lug and the receiver when the bolt lugs are positioned for firing. The gun is reassembled as part of the procedure.

Abstract: A gas-operated firearm having a novel bolt construction that includes a locking roller that delays momentarily the action of the bolt upon the firing of the firearm, such delay permitting the bullet to exit the barrel before the bolt can move. The delay is achieved by tapping a portion of the gas generated by the cartridge only after the bullet passes a gas port in the gun barrel to release the locking roller.

Abstract: A locking mechanism for a self-loading hand-held firearm includes a breech block carrier mounted for sliding movement in the longitudinal direction of the weapon and a breech block head which is rotatable about a longitudinal axis between a locked position and an unlocked position. The breech block head has a transverse control pin which is received in an oblique sliding guide formed in the breech block carrier. The sliding guide has first and second guide edge opposite to each other with different angles of inclination with respect to the longitudinal axis.

Abstract: The invention concerns a firearm for receiving and firing a projectile. The firearm includes an integral casing having a barrel and a breech block receiving area to the rear of the barrel. A breech block is guided through the breech block receiving area by separated guide pins which project from the breech block into respective longitudinal track sections in the barrel. The guide pins are axially separated at opposite ends of the breech block and are circumferentially separated. The longitudinal track sections meet circumferential track sections. The guide pins in the circumferential track sections permit the breech block to be rotated. The breech block has a forward closed barrel position and a rearward open loading position. A breech mount around the breech block has a cam slot that extends longitudinally and into which a cam follower pin from the breech block projects. The breech mount is drawn forward by a spring and driven rearwardly by the gas pressure from detonation of a projectile leaving the barrel.

Abstract: A weapon bolt has a bolt head which accommodates an axially slidable firing pin and which is rotatable and displaceable parallel to the barrel axis. A bolt handle is pivotally supported on an axle carried in a radial orientation by a control sleeve which is slidable in a chamber sleeve. The bolt handle is, in a form-fitting manner, coupled to a disengagement lever supportable on the chamber sleeve and upon its actuation, causes an axial motion of the axle. The control sleeve receives an axially slidable intermediate piece which surrounds the axle and is operatively coupled at its frontal side with the firing pin and at its rearward side with a striker which arms a firing spring. In the armed state of the firing spring the striker may be locked to the chamber sleeve, via a locking arrangement, by an arming member actuated by the disengagement lever.

Abstract: A bayonet-connector-like breech lock has a breech housing and a breech block with at least two radially projecting locking components. The enlarged region needed to rotate the locking components takes the form of an annular space wherein a locking sleeve is fitted to rotate between an open and a locked end position. The locking sleeve has a widened section for each locking component aligned with a widened part of the breech block bore in the open end position. The annular space is completely filled by the locking sleeve and the pushed-in breech block.

Abstract: A dual feed light machine gun comprises a barrel, a receiver, a cartridge lt feed mechanism assembly provided on top of the receiver, a magazine socket positioned at the bottom side of the receiver and essentially opposite the cartridge belt feed mechanism assembly. The machine gun includes a slide assembly having a slide which is essentially formed of an elongated, horizontal, rectangular frame with an integral bolt housing at the top near the rear end thereof and a gas piston attached at its front end. The bolt housing houses a bolt which has a head portion with upper and lower projections adapted, respectively, to drive a cartridge from either a belt or a magazine into the breech of the gun.

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 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: A belt-fed, gas-operated automatic weapon of a type in which the gas pressure developed in the barrel bore during firing is ported just forward of the barrel chamber to be utilized to compress a system of opposing spring sets which in turn operate the various mechanisms involved in the automatic or semi-automatic functioning of the weapon, including ammunition feeding and ejection, bolt locking and unlocking, and reciprocation. Dual power cylinders with symmetrically arranged pistons operated by the gas pressure compress all of the springs in the opposing spring sets by engagement with a sliding carriage. The forces exerted on the bolt locking mechanism by the spring sets are greatly reduced during the interval in which the locking mechanism is operated to reduce wear on the mating surfaces and to properly sequence the unlocking after discharging a round.

Abstract: A belt-fed, gas-operated automatic weapon of a type in which the gas pressure developed in the barrel bore during firing is ported just forward of the barrel chamber to be utilized to compress a system of opposing spring sets which in turn operate the various mechanisms involved in the automatic or semi-automatic functioning of the weapon, including ammunition feeding and ejection, bolt locking and unlocking, and reciprocation. Dual power cylinders with symmetrically arranged pistons operated by the gas pressure compress all of the springs in the opposing spring sets by engagement with a sliding carriage. The forces exerted on the bolt locking mechanism by the spring sets are greatly reduced during the interval in which the locking mechanism is operated to reduce wear on the mating surfaces and to properly sequence the unlocking after discharging a round.

Abstract: This invention relates to firearms of the type disclosed in my prior U.S. Pat. No. 3,198,077, granted Aug. 3, 1965, in which the bolt does not turn and the action is locked by turning the receiver. The principal parts, such as floating ring receiver piston and ring power cylinder are made from cylindrical extruded metal tubing or metal rods. The combination of floating ring receiver piston, ring power cylinder and other incidental parts are used to form a new action for an automatic firearm.This new action consists of a floating ring receiver piston, barrel and ring power cylinder. The above-mentioned parts, the frame and breech block lend themselves to manufacture by the use of automatic lathe and screw machines.

Abstract: A helical lock for an automatic gun operated by a rotating drum wherein a cking ring and mating end of the chamber have helical surfaces, whereby upon rotating the locking ring to locked position, the chamber is snugly urged into the barrel in its battery position and thus prevent gas leakage therebetween.

Abstract: In a rotary-cam operated weapon a locking and firing structure that distrtes the firing load symmetrically about the longitudinal axis of the weapon to eliminate nonsymmetrical stresses, and to coordinate the locking and firing timing relationships.

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 closed breech rocket gun has a tubular bolt with an outwardly extending lug thereon for locking the bolt in its forwardly projected position as the lug is shifted into engagement with an abutment wall on the receiver by means of a bolt operating plate guided thereon. The bolt operating plate effects retracted and projected movements of the bolt and locks it against the rear portion of the firing chamber at the rear portion of the barrel as it engages the lug in the projected position of the bolt.