Patent ID: 7866309

Claim:
A paintball gun, comprising: a frame having a chamber therein; a tube connected to the chamber of the frame to supply a high pressure gas; a barrel connected to a front end of the chamber of the frame; a piston, which is received in the chamber of the frame for reciprocation, having an impact portion, a stop portion facing the impact portion, and a plurality of apertures on a front end thereof; a spring received in the chamber of the frame to urge the piston toward the barrel; and a valve, which is mounted in the chamber of the frame and connected to the tube, having an actuator facing the impact portion of the piston; wherein the valve is located between the impact portion and the stop portion of the piston to form a front room between the valve and the stop portion and a rear room between the valve and the impact portion, and the rear room is communicated with the front room through a channel; wherein the piston is moved by the spring to have the impact portion pressing the actuator of the valve that the high pressure gas from the tube flows out of the valve and into the rear room, and then the high pressure gas flows to the front room through the channel and spurts out of the apertures to fire a paintball, and in the meantime, the high pressure gas in the rear room presses the impact portion to move the piston backward and compress the spring.