Patent ID: RE44328

Claim:
A paintball gun having an internal pressure regulator, comprising: a body, including: a hollow barrel having a first chamber; a first channel; a second channel; and a third channel; wherein the second channel and the third channel communicate with the first chamber, and a retaining flange is provided so as for the retaining flange to be adjacent to the third channel; a launching tunnel shaped as a hollow tube and having: one end defined as an intake end and an opposite end defined as an outlet end; and a retainer circumferentially provided inside the launching tunnel and provided with a buffer ring and a first airtight ring; wherein the launching tunnel is such received in the hollow barrel that the retainer is positioned between the second channel and the third channel of the first chamber; a rear lead shaft disposed in the first chamber of the hollow barrel, including a first end and an opposing second end, and having: a piston block disposed at the first end and provided with a second airtight ring for being fittingly coupled with the intake end of the launching tunnel; and a stepped tunnel provided at the second end of the rear lead shaft and having a fourth channel and a fifth channel, allowing the fourth channel to correspond in position to and communicate with the second channel of the first chamber in the body and the fifth channel to correspond in position to and communicate with the first channel of the first chamber in the body; the pressure regulator disposed in the stepped tunnel of the rear lead shaft to abut against a stepped surface of the stepped tunnel; and a back cover screwed to the body and centrally formed with a through hole.