Patent ID: 7730882

Claim:
A gun having a gas cartridge retaining device, comprising: a gun device having a hand grip, and the hand grip having a cartridge holding chamber; and a gas cartridge retaining device disposed at a bottom of the hand grip, and the gas cartridge retaining device including an upper piston element and a camshaft lever, the camshaft lever being displaceable to push the upper piston element upwardly, the gas cartridge retaining device including a bottom piston element fixed on the bottom of the hand grip, the upper piston element being slidably disposed in the bottom piston element, a top of the upper piston element extending into the cartridge holding chamber, and the camshaft lever being pivotally coupled to a bottom portion of the bottom piston element, the upper piston element including a column and the column being slidably disposed in the bottom piston element, the column having a groove, and a post penetrates through the bottom piston element and extends into the groove to limit the movement of the column in the bottom piston element.