| 摘要 |
A compressed gas operated hand gun includes an annular firing chamber defined between the sides of a main piston and the wall of a bore, the forward end of the piston cooperating with an annular valve seat which communicates with a projectile-holding chamber. In a cocked position the piston is held in sealing engagement with the valve seat by a trigger assembly and is biased in an opposite direction by the gas pressure in the firing chamber. Upon actuation of the trigger assembly the piston moves away from the valve seat and releases the charge of gas against the projectile. A fresh charge of gas is introduced into the firing chamber automatically from a high pressure gas chamber by a piston valve assembly concentrically disposed in the main piston and operated in response to gas pressure in the high pressure chamber. |
