Abstract: A gun for rapidly firing projectiles from a package inserted into a magazine as a cartridge and which are automatically fed into a propelling chamber and barrel connected thereto by a continuous stream of high pressure gas, a portion or all of which flows through the magazine. The flow of propellant gas is started and stopped by a manually or automatically controlled gate and the rate of firing and muzzle velocity of the projectiles are controlled by varying the pressure of the propellant gas, the geometry of the propelling chamber, or both. The magazine is so shaped as to deliver projectiles into the propelling chamber successively and the propelling chamber is so shaped as to direct the projectiles forwardly therein and form alternating slugs of gas and projectiles. The outlet from the propelling chamber may be connected through a flexible tube or directly to a curved or a conventional barrel.