Patent ID: 7533663

Claim:
A gun device comprising: a housing including an inner chamber formed a middle portion of said housing, and including a firing chamber formed in a front portion of said housing, and including a gas storage chamber formed in a rear portion of said housing, and including a handle for being held by a user, and including a trigger for being actuated by the user, and including a gas supplying passage formed in said housing and communicating with said gas storage chamber of said housing for coupling to a pressurized gas supplying source and for selectively supplying a pressurized gas into said gas storage chamber of said housing, and including a manifold formed in said housing, a feed tube attached to said housing for feeding a bullet into said firing chamber of said housing, and arranged for allowing said bullet to be selectively fired with the pressurized gas supplied into said gas storage chamber of said housing, a casing disposed in said housing and located in front of said gas storage chamber of said housing for forming a peripheral channel between said housing and said casing, and including a control chamber formed in said casing, and including a gas flowing path formed in said casing and communicating said control chamber of said casing with said manifold of said housing, said peripheral channel formed between said housing and said casing being communicating with said gas storage chamber of said housing, and said casing including at least one aperture formed therein and communicating said control chamber of said casing with said peripheral channel of said housing for allowing the pressurized gas to flow into said control chamber of said casing via said at least one aperture of said casing and then to selectively flow into said firing chamber of said housing to fire the bullet, a piston slidably received in said control chamber of said casing and movable relative to said casing for selectively engaging with said casing to block said gas flowing path of said casing, and means for controlling the pressurized gas to selectively flow into said control chamber of said casing and into said firing chamber of said housing and to fire the bullet, and to control the pressurized gas in said gas flowing path of said casing to selectively flow into said firing chamber of said housing and to fire the bullet.