Gas gun having pressure driving device

A compressed gas gun comprising:

• an upper housing including a barrel having a bore, and including a projectile feed tube attached to said barrel and opened into said bore of said barrel for supplying projectiles into said bore of said barrel one at a time, and including a high pressure storage chamber formed therein and communicating with said bore of said barrel,
• a lower housing having a hand grip extended downwardly for being grasped and held by a user,
• a loading bolt slidably engaged in said bore of said upper housing and movable to engage with said projectile that is supplied into said bore of said barrel for feeding said projectile forwardly toward a firing position, said loading bolt including a passage formed therein and communicating with said bore of said barrel for supplying pressure gas to propel or to fire said projectile,
• a pipe attached to said loading bolt and including an inner space, and including a pathway formed in a conduit and communicating with said inner space of said pipe, said pipe including at least one aperture formed therein for communicating said inner space of said pipe with said high pressure storage chamber of said barrel and said upper housing and for allowing the pressure gas to flow from said inner space of said pipe into said high pressure storage chamber of said barrel and said upper housing, and
• means for selectively enclosing said passage of said loading bolt to allow the pressure gas to flow into and filled within said inner space of said pipe and said pathway of said conduit and said high pressure storage chamber of said barrel and said upper housing, and for selectively disengaging from said passage of said loading bolt and enclosing said pathway of said conduit to allow the pressure gas to flow through said passage of said loading bolt and to fire said projectile.