Abstract: A hydraulic recoil device for a handgun or pistol is provided. The device includes a cylinder defining an interior hollow compartment having a first end and a second end. The device further includes a first resilient member; a piston assembly arranged adjacent to the first resilient member and at least partially within the cylinder, where the piston assembly includes a piston head, a piston rod, and a piston cap; a compressible accumulator arranged within the cylinder; and a second resilient member outside of the cylinder. When the piston rod is displaced toward the first end of the cylinder in operation, a hydraulic resistance is generated by the piston assembly, and when a first end of the second resilient member is displaced toward the second end of the cylinder in operation, additional resistance is generated by the second resilient member.

Abstract: A pistol with buffer has a frame defining an upper horizontal slide plane, having a forward muzzle end, and defining a receptacle, a slide rail module removably received in a rear portion of the frame receptacle and having a front face, a cross pin engaging the slide rail module to the frame, a buffer received in the frame receptacle and having a rear face abutting the front face of the slide rail module, and a retention portion of the slide rail module configured to contact the buffer to prevent extraction of the buffer when the slide rail module is received in the frame receptacle. The retention portion may be positioned above a selected portion of the buffer to prevent removal of the buffer from the frame when the slide rail module is engaged to the frame by the cross pin. The slide rail module may define a vertical front surface.

Abstract: Apparatuses, systems, and methods are provided for selectively changing the force required to cycle a firearm. In some embodiments, an apparatus is provided with at least two biasing members or springs where one biasing member generates a softer or smaller force than another biasing member. When manually cycling the firearm, the softer biasing member reduces the effort required for a person to cycle the firearm, which reduces the likelihood of injury and allows people with a broader range of physical abilities to cycle the firearm. Then, when the firearm fires a round, the other biasing member provides the greater force required to cycle the firearm in a conventional, semi-automatic or automatic manner.

Abstract: In some embodiments, a tunable recoil assembly is provided. The tunable recoil assembly may include a guide rod having a front end, a length, and a rear end; one or more springs around the length of the guide rod; and a removable cap releasably coupled to one of the ends of the guide rod. In some embodiments, the removable cap may be retained using a spring force, and may be slidingly coupled, twistingly coupled, or otherwise releasably coupled to the one of the ends of the guide rod.

Abstract: A buffer assembly is disclosed. The buffer assembly contains a buffer body, one or more magnets positioned along the buffer body, a hammer, a first spring, a spring guide, and an end cap removably coupled with the spring guide.

Abstract: An activation assembly for a sealed container includes a striker, a detent, and a shape memory alloy (SMA) wire connected to the detent. The SMA wire may move the detent from a first position to a second position relative to the striker based on activation of the SMA wire where, in the first position, the detent is engaged with the striker, and, in the second position, the detent is disengaged from the striker and the striker is movable from a stowed position to a deployed position.

Abstract: A captured spring recoil buffer has a rod with a flanged rear end and a shaft defining a pin passage slot. An action spring is fitted around the rod and is defined by a forward end and a rear end abutting against the flanged rear end of the rod. A buffer has a cylindrical sidewall and defines an axial bore, with the cylindrical sidewall further defining a pair of aligned crosswise pin openings normal to the bore axis. The buffer is in sliding engagement with the rod, and the forward end of the action spring abuts against the buffer. A dowel pin is positioned through the crosswise pin openings on the cylindrical sidewall of the buffer and through the pin passage slot of the shaft.

Abstract: A buffer assembly for a firearm includes an internal assembly comprising a plurality of weights within a buffer body of a buffer and at least one magnet. The magnet at least partially offsets an inertial event that occurs during a firing action of the firearm.

Abstract: A recoil mitigation apparatus formed into a stock of a rifle, featuring a removable spring housed inside a spring chamber formed inside a pair of coaxial, telescoping tubes that slideably compress the spring when energy from a rifle is generated and transmitted to the stock and thus to the apparatus. The spring compresses, absorbing the energy and thus reducing energy transmission to the user's shoulder against which the butt end of the stock is positioned. The spring chamber and spring are accessible by removing an end cap of the apparatus located at a butt end of the stock using screw fasteners fastened into preexisting holes formed in the end cap. The spring is centered inside the spring chamber by insertion over the spring mount attached to the end cap facing inwards towards the spring chamber.

Abstract: A buffer bumper assembly for use with some firearms that incorporate a recoil based operating system. The buffer bumper assembly may be disposed on a buffer bumper structure that may be installed inside of a recoil spring around an end thereof. The buffer bumper assembly comprises an upper segment, a lower segment, a biasing structure and a connector. The upper segment and lower segment are interconnected with the connector and reciprocally movable to one another. The upper segment and lower segment may be collectable disposable into and out of a compressed position and an uncompressed position. The biasing structure may at least partially assume the energy of an impact associated with a recoil cycle when it is compressed and when the upper segment and lower segment are collectively disposed in the compressed position.

Abstract: A linear-to-rotary converter assembly includes a housing having a first portion, a second portion, and a bore in which a plunger is slidably disposed. The plunger includes a plunger body having threads and a plunger boss extending from the housing. At least one of a one-way bearing or a disk is disposed within the housing bore. A rod is disposed within the housing bore and has a first portion having threads engaging the plunger threads and a second portion extending through the at least one of the one-way bearing or the disk. At least one magnet is disposed within the housing adjacent to the one-way bearing or the disk. Linear movement of the plunger between a firing position and a recoil position rotates the rod and the one-way bearing or the disk in a first direction as the magnet acts on the at least one of the one-way bearing or the disk.

Abstract: A buffer assembly to reduce recoil in a firearm includes a main body that is hollow from an opening extending from the end of the main body to about a shoulder that engages a recoil spring. An end cap is insertable into the opening and has a central hole, with a first larger diameter through a first portion and a second smaller diameter through a second portion. An operational rod has a first portion with a larger diameter and a second portion with a smaller diameter, sized to slidingly fit in the second smaller diameter hole of the end cap. The first portion's diameter is larger than the second smaller diameter of the end cap, providing a stop for the operational rod such that the operational rod cannot slide out of the end cap, and the second portion extends out from the end cap and terminates in a bumper.

Abstract: The installation space dimensions of a weapon system in the tower are complied with, and a loading space diameter of a caliber-larger weapon barrel is approximately maintained in relation to the smaller caliber. The required larger loading space volume for the caliber increase is predominantly achieved by an extension of the loading space of the caliber-larger weapon barrel relative to a loading space of the caliber-smaller weapon barrel itself. Since the loading space diameter of a larger caliber remains virtually unchanged, the outer dimensions of the caliber-larger weapon barrel also remain virtually unchanged compared to the outer dimensions of the caliber-smaller weapon barrel in the region of the loading part.

Abstract: A buffer extension assembly may include a body having at least one face and a cylindrical surface. The body may be disposed between and contact at least one of a buffer and a bolt carrier group such that the body increases both the effective mass and the effective length of the buffer. The body includes at least one hole extending along a length of the body.

Abstract: The installation space dimensions of a weapon system in the tower are complied with, and a loading space diameter of a caliber-larger weapon barrel is approximately maintained in relation to the smaller caliber. The required larger loading space volume for the caliber increase is predominantly achieved by an extension of the loading space of the caliber-larger weapon barrel relative to a loading space of the caliber-smaller weapon barrel itself. Since the loading space diameter of a larger caliber remains virtually unchanged, the outer dimensions of the caliber-larger weapon barrel also remain virtually unchanged compared to the outer dimensions of the caliber-smaller weapon barrel in the region of the loading part.

Abstract: In some embodiments, a firearm comprises a lower receiver, a bolt carrier, a buffer sleeve and a buffer. The lower receiver is arranged to support a hammer and an auto-sear. The bolt carrier comprises a body and a striker moveable with respect to the body between a first position and a second position. The buffer sleeve is arranged to contact the bolt carrier and to contact a buffer spring. The buffer sleeve defines an internal cavity and comprises open ends. The buffer is oriented in the internal cavity and extends through the buffer sleeve. The buffer is arranged to contact the striker and move the striker to the second position.

Abstract: A buffer assembly to reduce recoil in a firearm includes a main body that is hollow from an opening extending from the end of the main body to about a shoulder that engages a recoil spring. An end cap is insertable into the opening and has a central hole, with a first larger diameter through a first portion and a second smaller diameter through a second portion. An operational rod has a first portion with a larger diameter and a second portion with a smaller diameter, sized to slidingly fit in the second smaller diameter hole of the end cap. The first portion's diameter is larger than the second smaller diameter of the end cap, providing a stop for the operational rod such that the operational rod cannot slide out of the end cap, and the second portion extends out from the end cap and terminates in a bumper.

Abstract: In some embodiments, a firearm mechanism comprises a bolt carrier comprising a bolt carrier cavity, a buffer comprising a buffer cavity and a weight arranged to travel between the bolt carrier cavity and the buffer cavity. The buffer cavity comprises a damping mechanism comprising a reduction in a cross-sectional size of the buffer cavity. In some embodiments, the damping mechanism and weight comprise a valve arrangement arranged to pressurize the buffer cavity and damp kinetic energy carried by the weight.

Abstract: The present disclosure presents a barrel assembly for a firearm. The barrel assembly includes a barrel having an internal bore and an external surface, and a recoil spring lug affixed to an outside surface of the barrel. The barrel assembly also includes a slide moveably mounted relative to the barrel, and a recoil spring biased on the recoil spring lug and the slide.

Abstract: A spring system for blowback action is provided with a control piece (2) and pusher piece (3) supported so that it can be displaced on the guide rod (7). On its end, a buffer (4) is arranged with a buffer spring (6). The guide rod (7) is also used for guiding the closing spring (8). Between the control piece (2) and pusher piece (3) there are five rollers (10) in a recess (9) of the guide rod (7), and these rollers cause a delay of the action during the blowback after the discharge of a shot.

Abstract: In various embodiments, a buffer retention system may comprise a body, a retention tab and a spring. The body may comprise a generally cylindrical portion and a partially annular guide portion. The generally cylindrical portion may define a channel. The partially annular guide portion may be operatively coupled to the cylindrical portion. The retention tab may be installable in the channel. The retention tab may be configured to protrude through the partially annular guide portion. The spring may be installable within the channel. The spring may be configured to position the retention tab through the partially annular guide portion.

Abstract: A firearm bolt assembly for a self-loading firearm has an elongated frame defining a frame axis, a bolt connected to a forward end of the frame, a plurality of separate weights connected to the frame, and the weights being movable at least slightly with respect to the frame and to each other for movement along the axis. There may be a resilient spacer element between adjacent weights. There may be a resilient spacer element between one of the weights and a portion of the frame. The spacer element may be an O-ring. The weights may be connected to a rear portion of the frame. The weights may be tubular bodies each defining a bore. A portion of the frame may be received within the bore. The frame may define a rear portion having a first diameter, and a flange forward of the rear portion having a larger second diameter.

Abstract: A black rifle including a receiver with a bolt carrier movably located therein, a receiver extension tube connected to the receiver, the receiver extension tube including an aperture disposed at an end of the receiver extension tube, and a buffer assembly having an interface surface configured to interface with bolt carrier and being configured to reciprocate through the aperture within the receiver extension tube, the buffer assembly including an open fluid passage, through the buffer assembly, that is sized and shaped for enabling movement of the bolt carrier relative to the receiver and effect automatic or semi-automatic fire when the receiver extension is at least partially filled with water.

Abstract: An adjustable buffer optionally including at least some of a buffer element having an elongate buffer element body portion, wherein the buffer element body portion includes an externally threaded portion; a collar nut having a collar nut aperture formed therethrough, wherein at least a portion of the collar nut aperture is internally threaded so as to interact with the externally threaded portion of the buffer element body portion, and wherein one or more collar nut recesses are formed in the collar nut; and a locking collar having a locking collar aperture formed therethrough, wherein the locking collar aperture is formed so as to accept at least a portion of the buffer element body portion therethrough, wherein the locking collar includes one or more locking collar protrusions, and wherein the one or more locking collar protrusions are mateable with the one or more collar nut recesses.

Abstract: A recoil buffer system having a buffer element, wherein the buffer element extends from a first buffer element end to a second buffer element end; a shoulder extending from a portion of the buffer element; a spacer, wherein the spacer extends from a first spacer end to a second spacer end, wherein the spacer is slidable along at least a portion of the buffer element; a first recoil spring, wherein the first recoil spring extends from a first end of the first recoil spring to a second end of the first recoil spring; and a second recoil spring, wherein the second recoil spring is positioned between the shoulder and the first spacer end of the spacer, and wherein the first recoil spring is positioned such that a first end of the first recoil spring is abutted against and extends from the second spacer end of the spacer.

Abstract: A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.

Abstract: A method and apparatus for firing a plurality of disrupter loads in arbitrary order at the discretion of the user is disclosed. The loads may be of the same or different types. Both liquid and solid projectiles may be fired. Further, the disrupter may be operated by a user at safe standoff distance from a robotic mount with the aid of control, targeting, ranging and recoil systems.

Abstract: A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.

Abstract: Systems, mechanisms and methods are disclosed herein for absorbing recoil within a firearm. A first recoil absorption mechanism and second recoil absorption mechanism may be moved relative to each other in response to one or more recoil forces. At a certain point, the second recoil absorption mechanism moves toward and collides with the first recoil absorption mechanism. These forces, which are in part translated to the springs, reduce the amount of recoil experienced by the user of the firearm.

Abstract: Disclosed is a firearm configuration for a handgun. The firearm configuration is designed to reduce the recoil forces encountered by a user upon firing the weapon. Recoil forces are reduced by lowering the firearm's center of mass and by aligning a recoiling mass with the user's arm and trigger finger. The various detail of the present disclosure, and the manner in which they interrelate, will be described in greater detail hereinafter.

Abstract: A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is at least approximately 1.3 times that of a standard M16/M4. A piston can be formed on the bolt and can have a plurality of rings that are configured to cooperate with the piston to mitigate gas leakage past the piston. Each of the rings can have a key formed thereon and a gap formed therein such that the gap of one ring is configured to receive at least a portion of the key of another ring. The bolt carrier can have a double cut cam.

Abstract: A modified bolt carrier for automatic recoil rifles and pistols preferably includes a shortened bolt carrier, a shortened buffer tube, a modified bolt key and an end cap. The shortened buffer tube is shortened by cutting-off a straight portion of a prior buffer tube. The modified bolt key includes a prior art bolt key, a rod yoke, a pair spring rods, a pair of compression springs, a spring support disc and a spring plug. The spring plug is biased outward from the shortened bolt carrier with the pair of compression springs. The modified bolt key is attached to the shortened bolt carrier and retained in upper and lower receivers of an automatic recoil rifle or pistol. The bolt spring is slipped over the spring plug and the bolt spring is retained by securing the end cap to the lower receiver with a lock pin.

Abstract: A vibration-dampening polymeric sleeve is provided for installation within the tubular receiver extension of an AR-10 derivative assault rifle before the action spring and buffer are installed therein. The presence of the sleeve dampens noise and vibration caused by the action spring of an AR-10 derivative assault rifle slapping against the cylindrical wall of the receiver extension. For one embodiment of the sleeve, a generally rectangular sheet of laminar polymeric plastic material equipped with tabs at the rear thereof, that is rolled into a tube. The tabs, which are inwardly bent, are held against the closed, rear end of the receiver extension by the action spring, whether the spring is fully compressed or only partially compressed. For an alternative embodiment, the sleeve, a solvated liquid polymer compound is sprayed into the cylindrical chamber of an axially-rotating receiver extension and allowed to dry.

Abstract: A convertible gas piston conversion system for the AR-15, AR-10, or their variant rifle platforms is provided to convert the platform from a direct impingement gas system to a piston driven operating system. The conversion system includes a gas block having a barrel bore and two piston cylinder bores one on either side of the gas block. One of the piston cylinder bores is for utilization of the AR-15 rifle and the other of the piston cylinder bores is for utilization of the AR-10 rifle, making this piston system convertible for either the AR-15, AR-10, or any of their variant rifle platforms. A piston cylinder is inserted into the gas block via the piston cylinder bore and a piston is actuated inside the piston cylinder to cycle the rifle. A connecting link is coupled between the piston and an op-rod making the gas systems length adjustable by simply replacing the connecting link.

Abstract: In a recoil-spring device (100) in a handgun equipped with a breech and a recoil spring (110) in the form of a spiral spring, whose rear end abuts a rear stop member (123) on a recoil spring rod (120) and whose front end is mounted for movement along the recoil-spring rod (120) with contraction of the recoil spring (110), support in an uncomplicated recoil-spring eyelet is achieved in that the front end of the recoil spring (110) abuts, at least indirectly, a rear contact surface (132) of a contact element (131) that is mounted for movement along said contact-spring rod (120), while the front contact surface (133) is in contact with an internal surface of the breech of the handgun.

Abstract: A captured spring assembly for a firearm has a rod having a forward and rearward ends, a movable buffer that defines an aperture that receives the forward end of the rod and is operable to reciprocate between a forward battery position and a rearward retracted position, a coil spring that encompasses the rod, wherein the forward end of the rod has a limit element having a head that is larger in diameter than the rod, wherein the buffer has an internal limit element that is larger in diameter than the rod, and wherein the internal limit element has at least one portion that is smaller in diameter than the limit element head, but also larger in diameter than the rod. There may be a spring stop attached to the rearward end of the rod that is large enough for the spring to bear against and the buffer to strike against.

Abstract: A firearm such as a pistol includes a barrel which rotates and travels linearly relative to a frame of the pistol and a slide which travels linearly relative to the barrel and frame. The barrel has at least one stop located at a muzzle end for engaging at least one stop on the slide when the barrel is in a first rotational position to prevent linear movement of the slide relative to the barrel, which stops permit the slide and said barrel to move linearly relative to one another when the barrel is in a second rotational position. Another aspect of the invention comprises a control surface which is located on a barrel of a firearm. Yet another aspect of the invention comprises such features associated with a rotating, rather than tipping, firearm barrel. Yet another aspect of the invention comprises a replaceable energy buffer for a firearm.

Abstract: A reduced recoil weapon includes a housing and a receiver translatably disposed in the housing. A barrel is fixed to the receiver. A pair of recoil rods has first ends that are fixed to the receiver and are translatable with respect to the housing. Recoil springs are disposed around each recoil rod with first ends of the recoil springs abutting a forward surface of the housing. A bolt and bolt carrier are translatably disposed in the receiver. A bolt carrier return spring is disposed in the housing between the bolt carrier and a rear surface of the housing. Gas pressure from a gas piston on the barrel translates an operating rod toward the bolt carrier. An operating rod spring disposed in the receiver biases the operating rod toward the gas piston.

Abstract: A rifle with an upper receiver and a barrel attached to the upper receiver and including a bolt carrier, and operating, buffer, and cooling systems. The operating system includes a cylinder and a piston coupled to receive propelling gases from the barrel. As the piston moves between retracted and extended positions the bolt carrier is moved between closed and open positions. The bolt carrier includes a weight movable within a guide frame between rearward and forward limits. The buffer system includes a compression spring in a tube attached to the upper receiver in abutting engagement with the bolt carrier. A partially fluid filled cylinder is attached to a coil of the spring and includes a piston and shaft. The piston is formed so that fluid in the cylinder restricts movement in one direction and allows free movement in a second direction.

Abstract: A convertible gas piston conversion system for the AR-15, AR-10, or their variant rifle platforms is provided to convert the platform from a direct impingement gas system to a piston driven operating system. The conversion system includes a gas block having a barrel bore and two piston cylinder bores one on either side of the gas block. One of the piston cylinder bores is for utilization of the AR-15 rifle and the other of the piston cylinder bores is for utilization of the AR-10 rifle, making this piston system convertible for either the AR-15, AR-10, or any of their variant rifle platforms. A piston cylinder is inserted into the gas block via the piston cylinder bore and a piston is actuated inside the piston cylinder to cycle the rifle. A connecting link is coupled between the piston and an op-rod making the gas systems length adjustable by simply replacing the connecting link.

Abstract: The invention relates to the trigger and firing mechanisms for pistols. The inventive pistol comprises a frame (1), a barrel (2) with a cartridge chamber (3), a cartridge feeding mechanism (4), a fired case removing mechanism and a breech block return spring (12). The breech block (13) is slidable parallel to the barrel axis and comprises a firing mechanism, which consists of a firing spring stop (14), a firing spring (15), a striker (16) having a firing pin tip (17), a cocking notch (18) and rest pads for a firing spring (19) and for a striker spring (20). The breech block (13) includes a mechanism for sinking the firing pin tip (17) in a position, which makes possible the chambering of a cartridge, said mechanism having a striker spring (21), the force of which in a precompressed condition is greater than the precompressed force of the firing spring (15). The striker spring stop (22) is installed in the breech block (13) for fixing the precompressed force of the striker spring (21).

Abstract: A method and apparatus providing for a buffer for the movement of pistol slide against the frame. Wherein said buffer system minimally diminishes the rebound of said pistol slide such that the pistol is still functional with respect to proper blowback operation. Wherein said buffer fits the form of frame and directs pressure from glide rod radially.

Abstract: A captured spring assembly for a firearm has a rod having a forward and rearward ends, a movable buffer that defines an aperture that receives the forward end of the rod and is operable to reciprocate between a forward battery position and a rearward retracted position, a coil spring that encompasses the rod, wherein the forward end of the rod has a limit element having a head that is larger in diameter than the rod, wherein the buffer has an internal limit element that is larger in diameter than the rod, and wherein the internal limit element has at least one portion that is smaller in diameter than the limit element head, but also larger in diameter than the rod. There may be a spring stop attached to the rearward end of the rod that is large enough for the spring to bear against and the buffer to strike against.

Abstract: A frame is adapted to be held by a user. A barrel is coupled to the base. A slide is slidably received on the barrel and adapted for rearward movement in response to firing. A full-time spring is operable for abating recoil during the entire rearward movement of the slide including primary and secondary portions of the rearward movement. A recoil reducer includes a part-time spring. The part-time spring is operable for abating recoil during the primary portion of the rearward movement. The recoil reducer also includes an engager. The engager is operable in response to movement of the slide between the primary and secondary portions of the rearward movement to terminate operation of the part-time spring.

Abstract: A firearm barrel that reduces muzzle climb and recoil by tapping a portion of the discharge products near the breech and venting them toward the muzzle end of a firearm. Some discharge products have also have an upward component to reduce muzzle climb, some have a downward or sideways component to lessen the effect of the upwardly directed discharge products on a top mounted accessory such as a telescopic sight.

Abstract: A buffer tube for a firearm, which is not an M16-type firearm, the buffer tube including a recoil mitigation tube, a recoil piston reciprocatingly mounted inside the recoil mitigation tube, and a recoil absorbing mechanism disposed in the recoil mitigation tube and engaging the recoil piston.

Abstract: A recoil-reducing weapon may include a housing and a receiver translatably disposed in the housing. A barrel may have one end fixed to the receiver and be translatable with respect to the housing. A spring stop may be fixed to the barrel forward of the housing and a spring may be disposed between the spring stop and a front of the housing. An operating group with a gear rack may be translatably disposed in the receiver. A longitudinal member may have one end fixed to the operating group. A counter-mass may have a second gear rack and an opening therein for receiving the longitudinal member. A second spring may be disposed around the longitudinal member. One end of the second spring may bear against the operating group and another end of the second spring may bear against the counter-mass. A pinion gear may be rotatably fixed to the receiver and operable to mesh with the gear rack and the second gear rack.

Abstract: The present invention is directed to a bushing that allows for adaptation of a single spring guide rod assembly into handgun with dual spring guide rod assemblies to further allow for greater customization and control of the gun upon recoil when the chambered cartridge is discharged.

Abstract: A seismic gun system for surveying underground geological topology, the seismic gun system comprising a projectile, a seismic gun body, a barrel, and a guide tube. The projectile includes an outer tubular jacket and a frangible material in its interior. A exterior surface of the tubular jacket is textured to regulate tubular jacket disruption. The barrel includes a breach end and a muzzle end. The breach end is connectable to the seismic gun body for receiving the projectile into said barrel and said muzzle end directing the projectile towards the bottom of a bore hole. The guide tube has an upper end and a terminal end. The upper end of the guide tube is connectable to the muzzle end of the barrel. The guide tube has walls to direct the projectile towards the bottom of the bore hole when aimed therein.

Abstract: A rifle with an upper receiver and a barrel attached to the upper receiver and including a bolt carrier, and operating, buffer, and cooling systems. The operating system includes a cylinder and a piston coupled to receive propelling gases from the barrel. As the piston moves between retracted and extended positions the bolt carrier is moved between closed and open positions. The bolt carrier includes a weight movable within a guide frame between rearward and forward limits. The buffer system includes a compression spring in a tube attached to the upper receiver in abutting engagement with the bolt carrier. A partially fluid filled cylinder is attached to a coil of the spring and includes a piston and shaft. The piston is formed so that fluid in the cylinder restricts movement in one direction and allows free movement in a second direction.