Disclosed herein is a magazine rifle which includes a bullet loading mechanism and a firing mechanism interlinked to operate together by a single motor, thereby enabling single bullet firing, semi-automatic firing, and fully automatic firing. The magazine rifle includes a rotatable magazine, a bullet loading mechanism which loads a bullet received in the rotatable magazine into a cartridge chamber, and a firing mechanism which discharges compressed air from a compressed air cylinder according to manipulation of a trigger to allow the bullet loaded in the cartridge chamber to be fired through a barrel. The bullet loading mechanism and the firing mechanism are driven by a drive unit automatically driven by a single motor and a gear connected to the motor.