PROBLEM TO BE SOLVED: To simplify internal constitution of a cylinder body and a rotation support mechanism and to increase the volume of a gas tank, in constitution that a gas tank part and a valve opening closing mechanism are provided in a cylinder to improve a launching pressure of a bullet and to decrease the degree of consumption of gas liquid.;SOLUTION: A cylinder body forms a single casing. Rotation of only a gas induction nozzle 20 is constrained by abutting and engagement relation between a short column part 20a and a cylinder part 2a of a crane 2 inserted from an external part. A front end plate 12 to mount other bullet holding part 18, a gas tank part 29, and valve opening closing mechanisms 15, 30, and 31 form mounting constitution rotated integrally with the cylinder body 1. Since an annular space is constituted in the section of a gas induction nozzle 20, a magazine 21 for charging a bullet can be rationally mounted in a rotation constraining state by utilizing the space. A gas tank part 29 can be constituted with a cylinder part 11 of the cylinder body 1 forming an inner wall and an axial support mechanism is also simplified.;COPYRIGHT: (C)2002,JPO
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