Patent ID: 7523749

Claim:
A pneumatic gun comprising: a barrel with an interior defined therein and a piston unit movably received in the interior, a handle connected to the barrel and having a chamber, an inlet passage, a communication path, a release path and a free area defined between the communication path and the release path, an inlet defined between the inlet passage and the free area, a neck opening defined between the chamber and the free area, the communication path communicating with the interior, the release path communicating with the chamber, and a valve unit having a movable part, a piston member, a control member, a seat and a separation member, the movable part being reciprocally movable in the inlet, the free area and the chamber, a distal end of the movable part located not below a lowest periphery of the inlet when the valve unit is activated, the separation member located in the chamber and defining the chamber into an upper space and a lower space, the movable part movable between the inlet and the upper space, the piston member movable between the lower space and the seat, an end of the piston member extending through the separation member and located in the movable part, the piston member including guide holes which are in communication with the upper space of the chamber and the lower space of the chamber, a seal on the control member removably sealing the piston member to allow the piston member and the movable part to move.