The Probert Encyclopaedia of Warfare

GAU-8

The General Electric GAU-8/A Avenger is an American 30 mm calibre, seven-barrelled cannon fitted to aircraft. The GAU-8/A Avenger is designed as a tank killing cannon, and fires special armour piercing ammunition in ten two-second bursts separated by a one-minute cooling period, with a muzzle velocity of 988 meters-per-second and an effective range of 1235 metres. With armour penetration of 69 mm at 500 metres and 38 mm at 1000 metres.
Research GAU-8