MIL-G-45185, MILITARY SPECIFICATION: GUN, AUTOMATIC, 20-MM, M39A2 (W/ REPAIR PARTS AND W/O EQUIPMENT OR ACCESSORIES) (16 OCT 1958)

MIL-G-45185, MILITARY SPECIFICATION: GUN, AUTOMATIC, 20-MM, M39A2 (W/ REPAIR PARTS AND W/O EQUIPMENT OR ACCESSORIES) (16 OCT 1958)., This specification covers the requirements for one type of 20-MM gas operated, belt fed, electrically fired, revolver type weapon that may be adapted to either right hand or left hand feed (see 6.1).