Abstract: A paintball marker or other compressed gas firearm is provided including a ram driven by an electropneumatic valve when a trigger is actuated to cause a main valve between a high pressure air supply and a firing chamber to be opened. This ram assembly is independent from the main valve structurally and coupled to the air supply and electropneumatic valve sufficiently flexibly to allow the ram assembly to be operable when the ram assembly is displaced away from the main valve. A bolt is provided for directing pressurized air from the main valve to the firing chamber when the main valve is opened, and with the bolt configured to provide a high pressure air pathway which has a high degree of effectiveness in driving the ball out of the firing chamber without distorting a trajectory of the ball. The bolt can be stationary when air is flowing past the bolt.

Abstract: A paintball marker with a barrel that is coupled to a receiver. The marker may include a grip assembly in which an electronic circuit is disposed. The electronic circuit is configured to actuate launching of a projectile responsive to the trigger moving to the firing position.

Abstract: A bolt assembly for a paintball gun preferably includes a valve stem having an output port that can supply compressed gas to a compressed gas storage chamber. A bolt is preferably slidably mounted on the valve stem to move between a forward and a rearward position. The bolt can include one or more bolt ports configured to communicate compressed gas from the compressed gas storage chamber to a forward end of the bolt for launching a paintball when the bolt is in the forward position. When the bolt is in a rearward position, the bolt ports preferably communicate compressed gas from the outlet port of the valve stem into the compressed gas storage chamber. A sealing member can be arranged on the valve stem in communication with the bolt to prevent compressed gas in the compressed gas storage chamber from entering a forward bolt chamber when the bolt is in the rearward position and to permit compressed gas to enter the forward bolt chamber through the bolt ports when the bolt is in the forward position.

Abstract: The pneumatically powered projectile launching device has a bolt located within a body. A front gas chamber in the body has an opening through which the bolt extends into the chamber. The bolt can move forward and backward thereby changing the volume of the front chamber. The bolt has a backward facing working surface. A gas valve in the body selectively releases compressed gas into the chamber. The released gas applies pressure on the backward facing working surface of the bolt to move the bolt forward, and then passes through a passage in the bolt to pneumatically force the projectile to leave the device. Other embodiments are also described and claimed.

Abstract: An assembly for producing air projectiles. The assembly includes a driver with an attached converging nozzle. The driver includes a flexible diaphragm and is responsive to an electrical control signal to displace the flexible diaphragm from a first position to a second position. In one embodiment, the driver is an audio speaker driver such as a woofer and the diaphragm is a speaker cone or diaphragm. The nozzle has an inner bore or chamber that converges from a first size at a first end proximate to the driver to a second, smaller size at a second distal end. The second end of the nozzle may include a planar muzzle extending perpendicular to a central axis of the bore and including an outlet smaller than the diaphragm diameter. The driver has a rapid response to control signals such as less than about 20 milliseconds to produce a projectile at the muzzle.

Abstract: A marker fired by commands from a remote location for hunting games such as a paintball gun or a laser gun used in laser tag. The marker is controller by a variety of control systems, both open loop and closed loop. Such control systems allow remote error detection and correction of the projectiles of the markers.

Abstract: An improved pneumatic firing mechanism for a paintball gun of the electronic (automatic) type, having selectable burst-firing modes and integrated bolt and ram to improve efficiency and yet simplify manufacturing. The firing mechanism generally comprises a bolt formed with a forward portion and a fixed portion, and a coaxial valve piston inside the bolt, the valve piston being formed with a central passage for directing compressed gas from the gas inlet of said main body into the compressed gas storage area, said valve piston selectively preventing the release of compressed gas from the compressed gas storage area. Low pressure is employed in the gun in order to move the bolt rapidly forwardly towards its front shooting position, where the bolt causes high pressure gas to be released into the barrel through a high pressure gas passageway running through the center of the bolt. The number of paintballs fired in a single burst can be set by the user.

Abstract: A trigger system for a paintball marker has a string attached to the trigger actuator. The string is held taut between the actuator and the trigger guard. The actuator is a lever attached to the string and in contact with a micro-switch that allows the release of compressed air to propel a paintball.

Abstract: A gas powered gun has a gun barrel, a cylinder containing a primary piston moveable between a loading position and a firing position, a secondary piston moveable within the primary piston between a loading position in which the leading end of the secondary piston is sufficiently withdrawn in the barrel to permit a projectile to be fed into the barrel through an opening in the side thereof and a firing position in which the secondary piston has moved forwardly to cause the leading end of the secondary piston to engage the projectile and move the projectile forwardly in the barrel. A trigger is operable to cause the primary piston and the secondary piston to move simultaneously from the loading position to the firing position. The cylinder has a chamber through which the primary piston and the secondary piston extend.

Abstract: A device for firing projectiles comprising a housing having a chamber for retaining projectiles positioned therein and means for expelling the retained projectiles from the housing. An inverted cup is positioned within the chamber and includes an aperture connected to the expelling means. Compressed gas is provided within the chamber by a means for providing compressed gas and a means for activating the providing means is provided as well. Upon activating the activating means compressed gas is provided within the chamber by the providing means causing the projectiles to be caught by the inverted cup and forced through the aperture for expelling therefrom by the expelling means.

Abstract: A compressed gas injection device includes a projectile course for receiving and accelerating projectile bodies, a compressed gas housing which is connected to the projectile course and which is divided up into a compressed gas chamber and a working chamber by a partition. A working piston is arranged in the compressed gas housing and is provided with a valve plate which is arranged on the front end of the piston rod thereof for moveable rear closure of the projectile course, wherein the working piston is a movable backward closure element for the working chamber and the piston rod is guided through the partition.

Abstract: In a compressed air gun for use by police and firefighting forces for breaking open doors, including a compressed air cannon with an ammunition ball, wherein the compressed air cannon has a compressed air chamber, a barrel extending from the compressed air chamber and a discharge valve for releasing the pressurized air from the compressed air chamber into the barrel the ammunition ball consists of a hollow plastic ball which is filled with a heavy material providing, upon being shot out of the barrel by the compressed air, an impact force sufficient to break down a door to be opened without rebounding or generating shrapnel that could endanger a person using the gun.

Abstract: Paintball marker including a firing chamber having a barrel coupled to one end and a removable back plug coupled to an opposing end, a door surmounting a chamber loading hole disposed between back plug and barrel; a cam coupled to door; an actuator coupled to door cam; a pin valve interposed in a first gas path between a gas source and a passage leading to the chamber, and a trigger coupled to a second gas path between the gas source and actuator for opening the second gas path for actuating the actuator such that the door cam transforms motion of the actuator into pivoting motion of the door from an open position such that a paintball is loaded into the chamber to a closed position and then continuing to actuate the actuator to coact with the pin valve for opening the first gas path for firing the paintball.

Abstract: A paintball gun provides a double-acting trigger apparatus including a pair of finger engagement surfaces against which a user of the gun may employ a pair of trigger fingers. The user of the paintball gun may effect a firing operation of the gun by using either one of the two fingers to pull the trigger. Consequently, rapid firing operations of the gun are effected by dithering the two trigger fingers in rapid alternating motions to apply pressure on and off the two trigger engagement surfaces. Further, the paintball gun includes a programmable, microprocessor-based controller allowing the gun to be fired in response to a chosen discreet event in time. This chosen discreet event may include the opening and/or closing of a pair of switch contacts, for example; or the making or breaking of an electrical circuit effected between conductive components of the paintball gun.

Abstract: A paintball gun preferably includes a compressed gas storage chamber, a bolt, and a firing valve all arranged in a longitudinal chamber of the paintball gun. The bolt preferably includes a first and a second surface area. One of the two bolt surface areas is preferably larger than the other bolt surface area. The bolt can be operated by supplying compressed gas of the a selected pressure to one bolt surface area and selectively supplying compressed gas of the selected pressure to the larger of the two bolt surface areas. A firing valve can also be operated by supplying compressed gas of the selected pressure to differentially-sized surface areas of the firing valve.

Abstract: A pneumatically operated projectile launching device preferably comprises an electro-pneumatic flow distribution mechanism that receives and directs compressed gas to a pneumatic mechanism to open a bolt.

Abstract: In a paintball gun in which projectiles are admitted into the breech from a feed port through a radial aperture, sensors positioned in line with the aperture detect whether a projectile is completely or partially inserted into the breech, or totally missing. An electronic logic circuit allows the firing of the gun only when the projectile is fully inserted, and prevents the firing when the projectile is only partially inserted into the breech. A dry firing of the gun is enabled if the breech remains empty of any projectile for a short period. The dry firing is intended to dislodge any projectile jammed in the feed port.

Abstract: A control system for a paintball marker having a breach, the control system comprising a contact sensor, a controller, and a paintball firing mechanism, the sensor being arranged to be located within the paintball marker, to sense a paintball being in contact therewith and to produce a signal indicative of the presence of the paintball within the breech, and the controller being arranged to receive the signal and to control the actuation of the firing mechanism in response to the signal.

Abstract: A pneumatic assembly preferably includes a compressed gas storage area, a firing valve, and a bolt arranged along substantially the same horizontal axis. A valve retainer, a compressed gas storage area housing, and a bolt assembly are preferably arranged to form a substantially contiguous assembly housing. The firing valve is preferably configured to open when gas pressure is applied to a surface area thereof through a control valve. The bolt is preferably configured to move to a closed position before the firing valve is actuated. The control valve is preferably an electro-pneumatic valve configured to actuate the firing valve in response to a trigger pull of a paintball gun.

Abstract: An electro-pneumatically operated paint ball gun operates without the use of a mechanical sear, and includes a pneumatically operated hammer assembly effective to bump open a discharge valve and fire the gun. A programmable, microprocessor-based controller allows default values for time intervals of operation of the gun to be programmed, and also allows a user of the gun to access and change default values so that the operation of the gun can be modified to better meet the user's preferences. A cyclic rate of fire of as much as 30 paint ball shots per second or more is possible with a paint ball gun according to this invention. Further, a retrofit kit assembly provides for conversion of a conventional “autococker” type of paint ball gun into a gun embodying the present invention.

Abstract: An electronically controlled pneumatic paintball gun, comprising means for monitoring and/or controlling one or more parameters of the gun's operation and alphanumeric display means for displaying data related to said monitoring or control on a display panel integral with the gun.

Abstract: An electro-pneumatically operated paint ball gun operates without the use of a mechanical sear, and includes a pneumatically operated hammer assembly effective to bump open a discharge valve and fire the gun. A programmable, microprocessor-based controller allows default values for time intervals of operation of the gun to be programmed, and also allows a user of the gun to access and change default values so that the operation of the gun can be modified to better meet the user's preferences. A cyclic rate of fire of as much as 30 paint ball shots per second or more is possible with a paint ball gun according to this invention. Further, a retrofit kit assembly provides for conversion of a conventional “autococker” type of paint ball gun into a gun embodying the present invention.

Abstract: A pneumatic assembly preferably includes a compressed gas storage area, a firing valve, and a bolt arranged along substantially the same horizontal axis. A valve retainer, a compressed gas storage area housing, and a bolt assembly are preferably arranged to form a substantially contiguous assembly housing. The firing valve is preferably configured to open when gas pressure is applied to a surface area thereof through a control valve. The bolt is preferably configured to move to a closed position before the firing valve is actuated. The control valve is preferably an electro-pneumatic valve configured to actuate the firing valve in response to a trigger pull of a paintball gun.

Abstract: A pneumatic device for firing projectiles with a charge of compressed air that accelerates a projectile carrier and the projectile through a barrel. The charge of compressed air is released into the barrel behind the projectile carrier and acts on the projectile carrier to initially accelerate it and a ball or other projectile down the barrel. The diameter of the projectile carrier is slightly less than that of the barrel and it includes a concave recess that receives balls of differing diameters, centering as they are accelerated through the barrel. The barrel is sufficiently long so that the projectile carrier comes to a halt before being ejected from the barrel. An intake for a compressor that develops the charge of compressed air is coupled in fluid communication with the barrel, behind the projectile carrier. Operation of the compressor produces a partial vacuum so that ambient air pressure forces the projectile carrier back to its firing position.

Abstract: An electro-pneumatically operated paint ball gun operates without the use of a mechanical sear, and includes a pneumatically operated hammer assembly effective to bump open a discharge valve and fire the gun. A programmable, microprocessor-based controller allows default valves for time intervals of operation of the gun to be programmed, and also allows a user of the gun to access and change default values so that the operation of the gun can be modified to better meet the user's preferences. A rocking trigger assembly allows the user to achieve a faster rate of fire with better accuracy. Accordingly, a cyclic rate of fire of as much as 30 paint ball shots per second or more is possible with a paint ball gun according to this invention. Further, a retrofit kit assembly provides for conversion of a conventional “autococker” type of paint ball gun into a gun embodying the present invention.

Abstract: A pneumatically operated projectile launching device preferably comprises an electro-pneumatic flow distribution mechanism that receives and directs compressed gas to a pneumatic mechanism to open a bolt.

Abstract: An electronically controlled pneumatic paintball gun. The paintball gun includes an apparatus for monitoring and/or controlling one or more paramaters of the gun's operation. The gun also includes a system for providing information to a user related to the monitoring or control, including but note limited to firing mode, valve dwell time, ambient temperature, whether the gun is in live or safe mode, whether or not a fault has been detected, maximum rate of fire, battery status, and combinations thereof.

Abstract: A pneumatic assembly preferably includes a compressed gas storage area, a firing valve, and a bolt arranged along substantially the same horizontal axis. A valve retainer, a compressed gas storage area housing, and a bolt assembly are preferably arranged to form a substantially contiguous assembly housing. The firing valve is preferably configured to open when gas pressure is applied to a surface area thereof through a control valve. The bolt is preferably configured to move to a closed position before the firing valve is actuated. The control valve is preferably an electro-pneumatic valve configured to actuate the firing valve in response to a trigger pull of a paintball gun.

Abstract: A pneumatic assembly preferably includes a compressed gas storage area, a firing valve, and a bolt arranged along substantially the same horizontal axis. A valve retainer, a compressed gas storage area housing, and a bolt assembly are preferably arranged to form a substantially contiguous assembly housing. The firing valve is preferably configured to open when gas pressure is applied to a surface area thereof through a control valve. The bolt is preferably configured to move to a closed position before the firing valve is actuated. The control valve is preferably an electro-pneumatic valve configured to actuate the firing valve in response to a trigger pull of a paintball gun.

Abstract: A golf ball projecting air cannon capable of propelling a golf ball or similar projectile with high pressure to reach distances beyond 100 yards. The device employs an electronic circuit providing safety, firing, and reloading controls. The timer and motor provide for the timed activation of a series of microswitches and solenoids to distribute air to various ports at a designated position within the device to force appropriate movements.

Abstract: A paintball gun control system according to this invention includes an electronic circuit board configured to receive a sensor signal corresponding to a measured value of a paintball gun characteristic. The circuit board compares the measured value with a desired value. Based upon that comparison, the circuit board adjusts one or more characteristics of the paintball gun to bring the measured value into conformity with the desired value.

Abstract: An electronically-operated pneumatic launching device preferably includes a gun-shaped body having a trigger. A bolt preferably permits a projectile to be loaded into a chamber during a loading operation. The bolt can be configured to be opened by the application of pneumatic force. A valve is preferably located in the body and selectively supplies compressed gas from a compressed gas source to the chamber during a firing operation. An electrical circuit is also preferably arranged in the body to initiate the firing operation of the paintball gun in response to actuation of the trigger.

Abstract: A gas powered gun for firing paintballs dispensed from a magazine includes a bolt slidable within a breech section, a slidable hammer connected to the bolt and a spring to bias the hammer towards a forward firing position. A trigger operates an electrical circuit that includes a solenoid adapted to move a sear mechanism so as to release the hammer when the trigger is pulled. The solenoid has an actuating member movable from a lower position corresponding to the cocked position to a raised firing position at which the sear mechanism is disengaged from the hammer. An annular sealing member mounted at the bolt's front end is engageable with the barrel. The preferred sear member is elongate and pivots about a central transverse pivot axis. This sear member is engaged at its front end by the actuating member in order to release the hammer.

Abstract: A paintball gun is disclosed which includes a data link for transferring data to and/of from a remote terminal. The link may be a contact or contactless one. A removable data carrier may be used.

Abstract: A golf ball projecting air cannon capable of propelling a golf ball or similar projectile with high pressure to reach distances beyond 100 yards. The device employs an electronic circuit providing safety, firing, and reloading controls. The timer and motor provide for the timed activation of a series of microswitches and solenoids to distribute air to various ports at a designated position within the device to force appropriate movements.

Abstract: An electro-pneumatically operated kit assembly is provided for connection to a paint ball gun body, the kit assembly having a trigger initiating a programmed electrical control unit which actuates a first solenoid valve to move a hammer to open an air distribution path to allow pressurized air into the barrel to fire a paint ball sitting within the barrel of the gun body. The first solenoid valve then closes and a second solenoid valve opens to move a bolt away from the path of projectile storage path to release the next single paint ball into the barrel to await another trigger actuation. The first solenoid valve controls the movement of the hammer while the second solenoid valve controls the movement of the bolt so that the hammer and bolt move independently from each other.

Abstract: An electric firing controller for a lacquer bullet gun, comprising a power circuit, a lighting circuit indicating power turned on, a closing circuit having a single triggering switch and a capacitor, and an electromagnetic control unit. By operating the single triggering switch, the electromagnetic control unit is connected with the capacitor, discharging the capacitor and causing the electromagnetic control unit to trigger firing of a single lacquer bullet. In an extension of the present invention, automatic firing of lacquer bullets is controlled by repeated charging and discharging of the capacitor, as controlled by a pulse generator and a relay. Thus precise firing of lacquer bullets with little physical effort is controlled in an inexpensive way.

Abstract: An electrically operated paintball gun operable to shoot paintballs including a barrel, a trigger, and a breech connected to a rear end of the barrel, as well as a bolt movable in the breech between a rearward position and a forward shooting position. A spring biases the bolt towards the rearward position. A pneumatic circuit is provided to drive the bolt towards the forward position and includes a control valve in the form of a solenoid valve to receive gas under pressure and direct it into a chamber at the rear of the bolt when the gun is shot. An electronic circuit controls the pneumatic circuit and is operated by an electrical switch operated by the trigger. A gas valve mechanism is opened by engagement by the bolt, when the latter is driven forwardly to the shooting position, to permit the passage of relatively high pressure propellant gas into the barrel to propel a paintball.

Abstract: The pneumatically operated projectile launching device is preferably comprised of three principal elements: a body which houses and interconnects all of the pneumatic components and also houses the electrical power source, a grip mounted to the body which includes an electrical switch that activates a launching sequence, and an electrical control unit housed within both the body and the grip which directs flow between the pneumatic components to load, cock and fire the gun. The body preferably contains a plurality of bores in communication with each other including a bore containing and distribution pressurized gas, a bore containing a compressed gas storage chamber and mechanisms for filling the storage chamber with gas and releasing gas from the storage chamber to fire the projectile, and a bore containing mechanisms for loading and launching the projectile.

Abstract: A pneumatic assembly preferably includes a compressed gas storage area, a firing valve, and a bolt arranged along substantially the same horizontal axis. A valve retainer, a compressed gas storage area housing, and a bolt assembly are preferably arranged to form a substantially contiguous assembly housing. The firing valve is preferably configured to open when gas pressure is applied to a surface area thereof through a control valve. The bolt is preferably configured to move to a closed position before the firing valve is actuated. The control valve is preferably an electro-pneumatic valve configured to actuate the firing valve in response to a trigger pull of a paintball gun.

Abstract: A electric firing controller for a lacquer bullet gun, comprising a power circuit, a lighting circuit, indicating power turned on, a closing circuit, having a single triggering switch and a capacitor, and an electromagnetic control unit. By operating the single triggering switch, the electromagnetic control unit is connected with the capacitor, discharging the capacitor and causing the electromagnetic control unit to trigger firing of a single lacquer bullet. In an extension of the present invention, automatic firing of lacquer bullets is controlled by repeated charging and discharging of the capacitor, as controlled by a pulse generator and a relay. Thus precise firing of lacquer bullets with little physical effort is controlled in an inexpensive way.

Abstract: A gas regulator, relating in particular to a regulator for a gas or air cylinders, for supplying compressed air to a paintball gun or other compressed air powered projectile firing devices. A micro controller operably associated with the gas regulator is adapted to generate a shots remaining signal by receiving a pressure drop signal from a pressure transducer and a set of shot fired signals corresponding to the gas pressure drop signal. A method is also provided for generating the shots remaining signal using a second gas cylinder temperature signal, a temperature compensated shots remaining calibration constant and a gas regulator input pressure signal.

Abstract: The pneumatically operated projectile launching device is preferably comprised of three principal elements: a body which houses and interconnects all of the pneumatic components and also houses the electrical power source, a grip mounted to the body which includes an electrical switch that activates a launching sequence, and an electrical control unit housed within both the body and the grip which directs flow between the pneumatic components to load, cock and fire the gun. The body preferably contains a plurality of bores in communication with each other including a bore containing and distributing pressurized gas, a bore containing a compressed gas storage chamber and mechanisms for filling the storage chamber with gas and releasing gas from the storage chamber to fire the projectile, and a bore containing mechanisms for loading and launching the projectile.

Abstract: A confetti discharge device includes a tube with an air cylinder located in one end of the tube and confetti packed in the tube between the cylinder and a discharge end of the tube. A release mechanism includes a stopper located in a mouth of the cylinder and a keeper. The keeper is held in place by a latch that is manually releaseable by a user to allow the stopper to come out of the mouth of the cylinder due to air pressure so that the air in the cylinder discharges the confetti from the tube.

Abstract: A paintball gun in the present invention is provided with a screw hole formed in a back of a grip and extended through a chamber for being screwed with an adjusting screw whose inner end is protruded into the chamber and pressed against one sidewall surface of a magnetic-attraction plate, by which the adjusting screw is capable of being adjusted to make an inner end of the adjusting screw push the magnetic-attraction plate slightly forward or backward so that a lower end of a locking member is pushed by an outer end of a push rod of the magnetic-attraction plate to adjust the displacement height of the locking member for being fitted with different types of said gun bodies, and thus a single said grip is suited for being assembled with a gun body of different style to decrease the manufacturing of gun bodies with varied styles and lower the production cost.

Abstract: An electrically operated paintball gun operable to shoot paintballs including a barrel, a trigger, and a breech connected to a rear end of the barrel, as well as a bolt movable in the breech between a rearward position and a forward shooting position. A spring biases the bolt towards the rearward position. A pneumatic circuit is provided to drive the bolt towards the forward position and includes a control valve in the form of a solenoid valve to receive gas under pressure and direct it into a chamber at the rear of the bolt when the gun is shot. An electronic circuit controls the pneumatic circuit and is operated by an electrical switch operated by the trigger. A gas valve mechanism is opened by engagement by the bolt, when the latter is driven forwardly to the shooting position, to permit the passage of relatively high pressure propellant gas into the barrel to propel a paintball.

Abstract: The golf ball launching device employs an annular ring for mounting a golf ball within a barrel of the launching device upstream of a hinged cover through which the ball is mounted in the barrel. A blast of air from one end of the barrel propels the ball off the ring at a consistent velocity.

Abstract: An air gun firing system, working in conjunction with an air gun with a barrel and comprising: a bullet chamber on the front end of the main body, connected with the barrel for housing a bullet to be fired through the barrel; a lock, glidingly movable along the axis of the barrel, pushing the bullet into the bullet chamber, as driven by a lock driver, enabling the bullet to be fired, with a spring pulling back the lock; a gas chamber for driving the lock driver, accommodating the lock driver; a high-pressure gas container; a first pressure reducing valve; a second pressure reducing valve; and an electromagnetic valve, controlling flow of low-pressure gas into the gas chamber. When the electromagnetic valve opens, low-pressure gas flows into the gas chamber, driving the lock driver. When the electromagnetic valve closes, the spring pulls back the lock and the lock driver.

Abstract: A paintball gun according to this invention comprises a pressure regulator, an electronic solenoid valve, a firing valve assembly, a pneumatic ram assembly, and a firing chamber. The pressure regulator is configured to provide low pressure gas to a solenoid valve to control loading and firing operations of the paintball gun. The pressure regulator is further configured to supply low pressure gas to the firing chamber via operation of the firing valve assembly during a firing operation. The firing valve assembly can be configured with an opening, a valve chamber, and an exit port in fluid communication with the firing chamber, each having a size sufficient to allow an appropriate volume of gas flow to be supplied to the firing chamber with no significant drop-off in pressure. The firing valve assembly can also be provided with an o-ring seated around the valve cap to provide sensitivity to the firing valve, allowing it to open and close quickly in order to ensure near instantaneous shutoff with minimal load.

Abstract: An electrically operated paintball gun operable to fire paintballs including a barrel, a trigger, and a breech connected to a rear end of the barrel, as well as a bolt movable in the breech between a rearward position and a forward shooting position. A hammer is connected to the bolt and movable therewith and is slidable in a sealable chamber between a rearward position and a front shooting position. A spring biases the combination of the bolt and hammer towards the rearward position of each. A pneumatic circuit is provided to drive the hammer towards the front position and includes a control valve in the form of a solenoid valve to receive gas under pressure and direct it into the chamber at the rear of the hammer when the gun is shot. An electronic circuit controls the pneumatic circuit and is operated by an electrical switch operated by the trigger.