Abstract: A handgun having a frame with a barrel. The barrel has a muzzle end and a breech end. A handgrip is attached to the frame to be pivotable relative to the frame and movable along the length of the frame.

Abstract: A hands-free firearm stabilizer device comprising a means for securing a firearm to perpendicularly to the shoulder of a hunter. The fully adjustable device can be adjusted to accommodate any gunstock and hunter, allowing the hunter to wait for game in a relaxed hands-free position or utilize game calls without sacrificing firearm stability. Additionally, hunters can position themselves in a seated position allowing fine aiming adjustments using his/her knee preventing unwanted noise and movement that could be detected by the game and providing a viable option for hunters with disabilities that may limit their ability participate in the sport of hunting.

Abstract: The present invention is a spring-biased folding firearm that stows compactly and safely. The firearm has three main components: a stock, a receiver and a grip/magazine combination. In folding, the stock folds over the receiver, sandwiching the grip/magazine between the components. When folded, the magazine over-inserts into the grip housing, allowing the stock to clear and providing additional safety when stowed by isolating the ammunition feed. A buttplate latches over the open joint to contain the unit and further secure it. When stowed, the bolt is disengaged from the ammunition feed supply, preventing accidental firing, so a loaded round can be safely carried in the chamber—allowing for immediate use of the firearm upon opening. The weapon is deployed through single-handed actuation and is spring-assisted into firing position. Currently the firearm uses readily available aftermarket parts for easier replacement if necessary and does contain hardware for mounting accessories.

Abstract: A handgun having a frame with a barrel. The barrel has a muzzle end and a breech end. A handgrip is attached to the frame to be pivotable relative to the frame and movable along the length of the frame.

Abstract: An extendable butt stock includes a housing having a forward end, an open rearward end, an opening at the forward end and a buffer tube of a firearm received therethrough. A hinge plate pivotally attaches a butt plate to the rearward end of the housing, movable between an open position and a closed position. A spine reinforcing member having a rearward end and a forward end extends from the rearward end of the housing to proximate the forward end of the housing and cradles the buffer tube. The butt plate contacts the rearward end of the spine reinforcing member when the butt plate is in the closed position. An engagement mechanism is carried by the housing and releasably attaches the buffer tube to the spine reinforcing member.

Abstract: A method and apparatus are provided to mounted recoil dampening apparatus on a rifle at a selected slope, cant, length, and stowed position.

Abstract: A system and method for adapting a vertical fore grip to a user. In one embodiment, a system for adapting a vertical fore grip to a user can be provided. The system can include a vertical fore grip configured to adjustably attach to a firearm; a grip extension configured to modify the vertical fore grip, wherein the grip extension is further configured to mount at least one accessory; and a bolt assembly for adjustably attaching the grip extension to the vertical fore grip.

Abstract: A semi-infinitely-adjustable butt stock assembly. A butt stock is slidably affixed to a buffer stem. An over-center lock is attached to the butt stock adjacent to the buffer stem. The user can disengage the over-center lock from the buffer stem by rotating a lever thereby permitting the longitudinal position of the butt stock to be adjusted relative to the buffer plate. To secure the butt stock at the desired position, the user rotates the lever in the opposite direction causing the over-center lock to re-engage the buffer stem. A cheek rest overlaying the butt stock and biased forward with respect thereto is adjustable vertically with respect to the butt stock by manually moving the cheek rest aft, adjusting it vertically, and releasing the cheek rest.

Abstract: A removable butt stock with a curved and rounded butt plate for use in the tactical fighting position is disclosed. The removable butt stock has a single orientation two position release lever for ease of adjustment and removable of the butt stock from the buffer tube of the tactical weapon, ribs incorporated into the receiver bore to reduce drag during insertion of the buffer tube, and anti-rattle springs to securely attach the butt stock to the buffer tube. The body of the butt stock has an angled cheek weld to allow the user to comfortably align the eye on the weapon in the tactical firing position. The butt stock also includes two storage tubes with cam caps designed to be easily removable by twisting in a cam motion up the beveled mouth of the storage tube.

Abstract: The present invention is a modular stock system for rifles. The system replaces the rifle's buffer tube with a modified one containing a mount for a constant cheek weld and a rail track for adjustment. A stock module then mounts on the replacement buffer tube. The stock module is interchangeable depending on the user's needs. Various configurations of the stock module are discussed, including adjustable stocks, fixed stocks, and specialized stocks. The stock module may be made even further modular by the addition of rail system.

Abstract: An automatic or semiautomatic rifle having a receiver and a bolt carrier movably coupled to the receiver. An action system is connected to the bolt carrier for cycling the bolt carrier in the receiver. A receiver extension is connected to the receiver, at least part of the action system extending into the receiver extension. A folding stock is connected to the receiver. The receiver extension is located within the folding stock.

Abstract: An automatic or semiautomatic rifle having a receiver and a bolt carrier movably coupled to the receiver. An action system is connected to the bolt carrier for cycling the bolt carrier in the receiver. A receiver extension is connected to the receiver, at least part of the action system extending into the receiver extension. A folding stock is connected to the receiver. The receiver extension is located within the folding stock.

Abstract: A handle (20) for rapidly firing a semi-automatic firearm (22) having a trigger (24). The handle (20) includes a grip portion (52) defining a channel (54). A block (60) that is connected to the firearm (22) is slidably disposed in the channel (54) for allowing longitudinal movement of the firearm (22) relative to the handle (20). The handle (20) also includes a trigger guard (66) disposed on one side of the trigger (24) and extending longitudinally forward of the trigger (24) by a predetermined distance (D) to an open end. The trigger guard (66) presents a finger rest (70) for placing a trigger finger (74) on the trigger guard (66). The trigger guard (66) restricts access to the trigger (24) until the firearm (22) is moved longitudinally forward by the predetermined distance (D) relative to the handle (20).

Abstract: A handgun having a frame with a barrel. The barrel has a muzzle end and a breech end. A handgrip is mounted to the frame to pivot about an axis. The handgrip is movable between a firing position and a storage position. The axis is movable relative to the frame along a path extending in a direction of the barrel wherein the handgrip is movable along the length of the frame to the storage position wherein the handgrip is adjacent the frame.

Abstract: A handgun comprised of a frame having a barrel with a muzzle end and a breech end. A slide is movable on the frame between one of a closed position and a blow-back position. A handgrip is pivotally mounted to the frame about an axis, wherein the handgrip is movable between a firing position and a storage position. A trigger guard is attached to the frame. The trigger guard is movable between a firing position and a storage position, wherein the trigger guard is collapsible relative to the frame.

Abstract: A firearm, in particular an automatic or semi-automatic rifle, with a simplified disassembly, including a receiver, a barrel, a bolt assembly, a foldable stock and a removable lower receiver with a magazine and a release mechanism, is equipped with a lower receiver inserted with shape coupling in the lower open part of the receiver between a front seat and a rear seat of the receiver, wherein the front seat, coupled with at least one complementary surface of the lower receiver, forms a front articulation for the rotation of the lower receiver with respect to the receiver, also including a mechanism for blocking the lower receiver in at least two different positions.

Abstract: A butt stock for a shoulder held firearm with an horizontally and vertically adjustable cheek rest, reversibility of the cheek rest without loss of any of the other adjustments, a shoulder pad assembly to allow from 0 to 360 degrees of adjustment of the angle of the shoulder pad to the rest of the shoulder held firearm, an adjustable length of pull, and a butt stock body that could function as a cheek rest even if the adjustable cheek rest were to be disconnected.

Abstract: A firearm may have a plurality of power-consuming accessories that can be attached to the weapon. In order to reduce the weight of these power-consuming accessories, as well as the proliferation of their batteries, the Weapons Accessory Power Distribution System provides a common power source to power the power-consuming accessories attached to the weapon. One or more powered rails are provided on the handguard, which encircles the barrel of the weapon, to provide a point of mechanical and electrical interconnection for the power-consuming accessories to provide quick connect mounting and dismounting of the power-consuming accessory, absent the use of connectors with their tethering cables, which are susceptible to entanglement. The powered rail(s) are electrically interconnected with a power source, which typically is a battery mounted in the butt stock of the weapon.

Abstract: Adjustable shoulder stock apparatus for use with firearms are described. An example adjustable shoulder stock apparatus for use with firearms includes a shoulder stock into which a connecting piece of the firearm is to be inserted. The connecting piece defines a plurality of boreholes. Additionally, the example adjustable shoulder stock apparatus includes a bolt having a end to be inserted in one of the plurality of boreholes to secure the shoulder stock relative to the connecting piece. Further the example adjustable shoulder stock apparatus includes a lever that defines a recess that is open toward a top of the firearm and is closed toward a bottom of the firearm. An opposite end of the bolt is positioned in the recess and coupled to the lever. The lever is to remove the bolt from the one of the plurality of boreholes. The lever comprises a projection to engage a wall of the shoulder stock to prevent movement of the lever past the wall.

Abstract: A collapsible firearm stock system is generally provided and preferably includes a shoulder stock system adapted to receive a buttstock thereon, and a locking linkage having a first linkage portion, a second linkage portion, and a hinge pin operatively uniting the first and said second linkage portions. One of the linkage portions is carried by the shoulder stock assembly so as to define a terminal end therefore, the other of the linkage portions being adapted to be carried by a firearm. Each of the linkage portions are adapted so as to automatically unite in locking engagement upon axial alignment of the shoulder stock assembly with the firearm about the hinge pin.

Abstract: A collapsible stock which includes a stock body having a buffer tube holder, a firearm buffer tube slidingly mounted in the buffer tube holder, the stock body being arranged for linear reciprocating motion relative to the buffer tube during firing of the firearm, a recoil absorbing mechanism mounted inside the stock body and affixed to the buffer tube, and a locking pin mounted through the stock body and affixed to the buffer tube, the stock body being arranged for motion relative to the locking pin during firing of the firearm.

Abstract: A firearm butt stock with an adjustable cheek piece comprises an elongate stock base having a top, a bottom, a right side, a left side, a proximal end and a distal end. The stock base has a transverse pivot shaft near the stock base top and a transverse catch shaft spaced from the pivot shaft lengthwise of the stock base near the stock base top. A cheek piece has a proximal end and a distal end and a left and a right sidewall. The cheek piece defines a plurality of lengthwise stacked receptacles opening toward a proximal end of the cheek piece and an elongate hole having a distal and a proximal end spaced lengthwise and distal of the stacked receptacles. The stacked receptacles, the catch shaft, the elongate hole and the pivot shaft are configured so that with the pivot shaft received in the elongate hole and the pivot shaft at the distal end of the elongate hole, the catch shaft is received in one of the stacked receptacles and the cheek piece is prevented from pivoting about the pivot shaft.

Abstract: A firearm buttstock includes a buttstock body having first, second and third passages. A transfer member is received in the second passage and a retaining member is received in the third passage. A firearm is also disclosed that has a receiver extension. The firearm buttstock can be supported on the firearm such that the receiver extension is received within the first passage. A method of assembling a firearm buttstock assembly is also included.

Abstract: A rapidly-adjustable butt stock assembly comprised of a butt stock, a buffer, a slot cylinder, a key cylinder, and keys. The butt stock has a cylindrical recess with key grooves longitudinally therein for receiving the slot and key cylinders. The key cylinder is rigidly attached to the buffer. The slot cylinder has at least one longitudinal slot with a plurality of transverse slots extending therefrom. The key cylinder carries one or more keys, which keys extend through the key cylinder and the slot cylinder and into the key grooves of the butt stock. To adjust the length of the assembly, the user rotates the slot cylinder so that the keys rotate out of the transverse slots and into the longitudinal slot of the slot cylinder thus permitting the key cylinder to move axially with respect to the butt stock.

Abstract: The invention provides a variable bend that allows a cheek rest to be accurately adjusted and to be firmly fixed to a gunstock without impairing the gunstock. A pad base is fixed between a rear-end face of the stock and a shoulder pad. A bend frame is fixed to the stock by plastically deforming a joint portion in conformity with a shape of an upper part of the stock, by adhering the joint portion with the upper part of the stock and by fixing an attachment plate to a coupling portion of the pad base. Then, the cheek piece is vertically adjustably fixed to the bend frame.

Abstract: A stock system for a shoulder-supported weapon the holding and supporting stock (10) of which for accepting the weapon system comprises: a pistol grip (12), an at least sideways-adjustable and height-adjusting cheek piece (15), and a pivotable and length-adjustable butt plate unit (16), which are assigned to a middle piece (14) forming part of the stock (10), which is designed as a coupling for creating a positive connection between the weapon system and the stock parts (12, 15, 16) forming the stock (10), which connection can be released by the application of force.

Abstract: A collapsible firearm stock system is generally provided and preferably includes a shoulder stock system adapted to receive a buttstock thereon, and a locking linkage having a first linkage portion, a second linkage portion, and a hinge pin operatively uniting the first and said second linkage portions. One of the linkage portions is carried by the shoulder stock assembly so as to define a terminal end therefore, the other of the linkage portions being adapted to be carried by a firearm. Each of the linkage portions are adapted so as to automatically unite in locking engagement upon axial alignment of the shoulder stock assembly with the firearm about the hinge pin.

Abstract: The present invention is a modular gunstock utilizing a two-piece mounting structure and a stock module. The structure comprises a weapon attachment, in the case of an AR15/M16 rifle a receiver extension tube, and a sleeve slidable over said attachment and containing mounting structure for the stock module. The disclosed stock module is adjustable for length and features a length pre-set system, a latch with independent dual-pawls and an integrated impact buffer, modular tailpiece, and storage. The sleeve also features a position selectable fixed cheek plate.

Abstract: The present invention is a modular gunstock utilizing a two-piece mounting structure and a stock module. The structure comprises a weapon attachment, in the case of an AR15/M16 rifle a receiver extension tube, and a sleeve slidable over said attachment and containing mounting structure for the stock module. The disclosed stock module is adjustable for length and features a length pre-set system, a latch with independent dual-pawls and an integrated impact buffer, modular tailpiece, and storage. The sleeve also features a position selectable fixed cheek plate.

Abstract: A stock (10) for a firearm, provided with a stock frame section (3) and a releasably attachable cheekpiece (1, 2), in which the stock frame section (3) is symmetrical in relation to the longitudinal vertical direction of the stock, and when the cheekpiece (1, 2) is installed to the left side of the stock frame section (3), the stock becomes a right-handed stock, and when the cheekpiece (1, 2) is installed to the right side of the stock frame section (3), the stock becomes a left-handed stock. According to an advantageous embodiment the cheekpiece (1, 2) is adjustable, preferably quick-adjustable in height.

Abstract: Devices, systems and methods of canting, tilting, and rotating firearms such as rifles relative to fore grip. One version allows for a rocking and canting of the firearm by pivotally attaching an upper portion of expanded legs. Another version allows for a separate canting member to be clamped to both the upper portion of a vertical fore grip and to the lower mounting rail of the firearm. The canting member has portions that cant (move to the left or to the right) relative to one another. An operator can cant the firearm in a free-state or to fixed positions as desired. Another canting embodiment allows for an extra sleeve to compress the legs on the fore grip inward allowing the upper pivoted connection of the legs to move within the lower fore grip housing. Embodiments to allow the fore grip to rotate can also made part of the fore grip.

Abstract: The present invention is a modular handgrip for rifles and other long guns. The handgrip features a base with a locking dovetail rail on a first side and a second opposite side configured to receive a rail. Back strap additions are provided capable of receiving the rail on the body, which are customizable to a user's preferences while fore straps are provided with rails in a similar manner. Also provided is a storage compartment inside the main body, accessible from a bottom of the grip. As such, an organization, such as an armory, can provide a number of customizable options for handgrips while only stocking a basic grip and a number of optional modules at lower unit and storage costs. Of particular note is a modular fore strap design with an integrated trigger guard.

Abstract: A gun attachment holder includes a device holder, which has a coupling groove detachably coupled to a coupling flange of a gun and a sliding groove transversely extending across the coupling groove, two locking members reversely arranged in parallel and slidably mounted in the sliding groove and movable between a locking position to lock the device holder to the coupling flange of the gun and an unlocking position to unlock the device holder from the coupling flange of the gun, and a torsional spring set in between the locking members to hold the locking members in the unlocking position.

Abstract: A folding stock assembly for firearms such as rifles and shotguns. The stock is made of metal rod that has been bent to form laterally spaced left and right elongated arm members that have rear ends connected to the top end of a U-shaped shoulder rest portion. The front end of the respective elongated arm members are pivotally connected to the rear end of a neck portion extending rearwardly from the upper end of the handgrip. There is structure in the interior of the end cap for locking the elongated arm members in either its static storage position or its rearward functional deployed position.

Abstract: A collapsible firearm stock system is generally provided and preferably includes a shoulder stock system adapted to receive a buttstock thereon, and a locking linkage having a first linkage portion, a second linkage portion, and a hinge pin operatively uniting the first and said second linkage portions. One of the linkage portions is carried by the shoulder stock assembly so as to define a terminal end therefore, the other of the linkage portions being adapted to be carried by a firearm. Each of the linkage portions are adapted so as to automatically unite in locking engagement upon axial alignment of the shoulder stock assembly with the firearm about the hinge pin.

Abstract: An adapter for mounting an accessory on a shroud such as is found on an M2 machine gun includes a rigid block embracing the shroud. Blunt-nosed helically threaded plugs penetrate the block and intrude partly into perforations of the shroud. Retaining rings, threaded oppositely to the threaded plugs, prevent the plugs from backing out. A key tool is provided to tighten the plugs and retaining rings. A longitudinally oriented T-rail projects radially from the block. A slide body engages the T-rail and includes a locking mechanism, a lamp assembly, a logically switched power control, a power cable, and a control cable with interchangeable switches.

Abstract: The present invention provides an adjustable cheek rest for installation on the butt stock of a firearm, the cheek rest having an elongate comb adapted to conform to the top portion of the butt stock, the comb being supported on a rail that is fixed to, or removably mounted to, one side of the butt stock. The cheek rest comb is adjustable both longitudinally and vertically with respect to the butt stock to suit the needs of a particular shooter, the comb being attached to the butt stock by a fixture slidably engaging the rail to permit longitudinal adjustment and slidably engaging the comb to permit vertical adjustment. Once adjusted, the comb may be secured in a desired longitudinal and vertical location. A removable rail is also provided for mounting the cheek rest and/or other accessories to a firearm butt stock not having a fixed accessory mounting rail.

Abstract: A method for upgrading a non-recoil suppressing (NRS) stock to a special operations (Spec Ops) stock with full recoil suppression. The new parts are the slide member and lever that has a cam member mounted on its upper end and an extension spring attached to its bottom end. A locking pin is removed from the stationary slide member and two retainer pins are inserted from the sides into the new slide member to facilitate spring action. This structure functions in the same manner as the recoil reduction structure illustrated in U.S. Pat. No. 5,722,195. A replacement sleeve has a rib member extending downwardly from its bottom surface. Replacement sleeve and extension spring are assembled in a tubular member to form a second recoil reduction assembly. This recoil reduction structure functions in the same manner as the structure illustrated in U.S. Pat. No. 6,732,466.

Abstract: A weapon ball-and-socket-based weapon mounting system for removably attaching a to the body of a user. A ball stock adapted to be attached to a weapon at one end and configured with a substantially ball-shaped ball element on the other end replaced the conventional weapon butt stock. The ball stock mates with a body-supported socket adapted to receive the ball element by clicking in to the socket. The user is able to articulate the weapon into a rest position as well as rotating it through a full range of elevation and sweeping orientations.

Abstract: A pivotable shoulder stock for use in combination with a handgun includes a mirror and allows the user to aim and fire an equipped laser handgun around the corner of a building or other obstacle. The user is able to fire with relative accuracy from behind a building or other obstacle using the mirror attached to the shoulder stock. The mirror can be adjustably positioned for viewing in order to fire the handgun at about a ninety degree (90°) angle in either a clockwise or counterclockwise direction. The mirror can be revolved to a downward posture when firing the handgun in a linear direction similar to a rifle or for storage purposes. The pivotable shoulder stock is relatively simple to operate and can be quickly adjusted by latching the second section against the first section for use as a hand weapon rather than being shoulder fired.

Abstract: The invention concerns an adjustable recoil pad for a small arm, in particular, a rifle, with a base plate that can be adjustably affixed to a stock part of the small arm, a bottom plate which is adjustably mounted on the base plate, and at least one end part that can be affixed to the bottom plate. A simplified adjustment with a large number of adjustment possibilities is made possible in that the bottom plate is arranged so it can swivel about a transverse axis on a connecting piece, which is displaceably guided via guide elements on the base plate, and can be affixed in a desired position by at least one retaining screw.

Abstract: A vertical fore grip for a firearm with an integrated pressure switch pocket. The vertical fore grip includes a body with internal storage cavity, a mount adapted to secure a firearm, a pocket for a pressure switch on the perimeter of the body, and a cap to secure a pressure switch and waterproof the internal storage cavity. The mount has a groove for a firearm rail, at least one locking bar, and a spring for engaging the locking bar to a firearm rail.

Abstract: A pivotable shoulder stock for a handgun allows the user to aim and fire a handgun around the corner of a building or other obstacle. The user is able to fire with relative accuracy from behind a building or other obstacle using a mirror attached to the shoulder stock. The mirror can be adjustably positioned for viewing in order to fire the handgun at about a ninety degree (90°) angle in either a clockwise or counterclockwise direction. The mirror can be removed when firing the handgun in a linear direction similar to a rifle or for storage purposes. The pivotable shoulder stock is relatively simple to operate and can be quickly adjusted while under assault conditions.

Abstract: A firearm butt stock with an adjustable cheek piece comprises an elongate stock base having a top, a bottom, a right side, a left side, a proximal end and a distal end. The stock base has a transverse pivot shaft near the stock base top and a transverse catch shaft spaced from the pivot shaft lengthwise of the stock base near the stock base top. A cheek piece has a proximal end and a distal end and a left and a right sidewall. The cheek piece defines a plurality of lengthwise stacked receptacles opening toward a proximal end of the cheek piece and an elongate hole having a distal and a proximal end spaced lengthwise and distal of the stacked receptacles. The stacked receptacles, the catch shaft, the elongate hole and the pivot shaft are configured so that with the pivot shaft received in the elongate hole and the pivot shaft at the distal end of the elongate hole, the catch shaft is received in one of the stacked receptacles and the cheek piece is prevented from pivoting about the pivot shaft.

Abstract: A telescoping stock for a firearm, the stock including a stock body having an upper mounting rail, a buffer tube holder for receiving a firearm buffer tube, the buffer tube holder having a complementary mounting rail, and locking means for selectably locking the buffer tube holder in any one of a plurality of positions relative to the stock body. Preferably, the telescoping stock also includes a telescoping cheek rest.

Abstract: Devices, systems and methods of canting firearms such as rifles relative to fore grip having extendable and expanded legs. One version allows for a rocking and canting of the firearm by pivotally attaching an upper portion of the expanded legs. Another version allows for a separate canting member to be clamped to both the upper portion of a vertical fore grip and to the lower mounting rail of the firearm. The canting member has portions that cant (move to the left or to the right) relative to one another. An operator can cant the firearm in a free-state or to fixed positions as desired.

Abstract: A shoulder support is fabricated of a light weight material. The shoulder support has a generally cylindrical front portion. The shoulder support has a connecting end and a rear portion. In this manner a generally triangular configuration is formed. The shoulder support has a central extent having a top end and a rear end with an intermediate portion. The rear portion has a concaved resting member. The resting member is adapted to rest against the front of a shoulder of a user. A coupling means is rotatable about a vertical axis and is adapted to couple the shoulder support to an end of a rifle.

Abstract: A heavy-duty adjustable length butt stock assembly for a firearm such as an AR15 rifle or any other firearm that is made to accept an AR15 butt stock. The stock is designed to be stronger than any existing production AR15 butt stock. The butt stock has three major components, the butt, the receiver extension tube and the clamping gusset The front end of the butt stock has a primary bore hole that extends inwardly from its front end to the rear end of the butt stock. The receiver extension tube is telescopically received in the primary bore hole. An adjustment push button lock extends inwardly from one of the lateral sides of the butt stock and it actuates locking plunger pin that can mate with various longitudinally spaced transversely extending grooves on the bottom surface of the receiver extension tube. Various sling mount structures can be formed on the butt stock or on a clamping gusset that is removably inserted over the receiver extension tube adjacent its front end.

Abstract: A firearm grip with a rest is provided, which at least has a grip body with a hollow portion, a shell encasing and combined with an outside of the grip body and exposing a bottom of the grip body, and a rest received in the grip body and capable of being projected from the bottom of the grip body to position and support the firearm grip against a setting surface. The grip body and the rest can be coupled to each other by an elastic member that allows the rest to be resiliently retracted back into the grip body. Alternatively, the rest can be pivotally coupled to the grip body and rotatably retracted into the grip body. The above firearm grip eliminates the shortcomings of the prior art.

Abstract: A gun device includes a housing having a gas supplying passage communicating with an inner chamber of the housing for coupling to a pressurized gas supplying source, a feed tube attached to the housing for feeding a bullet into the housing, a tubular member rotatably received in the housing and having an opening communicated with a bore of the tubular member for aligning with the feed tube and for selectively receiving the bullet into the bore of the tubular member. The opening of the tubular member is movable or disengageable from the feed tube when the tubular member is rotated relative to the housing for preventing the other bullet from entering into the housing.