Abstract: A magazine of the present invention includes a main body and a plug member. The main body is formed with a trough and a recess. The recess has a lateral opening, a top portion and a bottom portion. The recess is provided to receive an air cartridge between the top portion and the bottom portion. The lateral opening is used for the air cartridge being put therethrough. The main body is formed with a hole passing through the bottom portion and communicating with the recess. A diameter of the hole is smaller than a maximum diameter of the air cartridge. The plug member is screwed into the hole so as to press the air cartridge. Accordingly, the plug member gradually presses the air cartridge by screw action. Once the plug member is completely screwed into the hole, the air cartridge is fixed in the recess.