GAU-8 Avenger
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The General Electric GAU-8/A Avenger is a 30 mm hydraulically driven seven-barrel Gatling-style autocannon that is primarily mounted in the United States Air Force's Fairchild Republic A-10 Thunderbolt II. Wikipedia
Rpm: 3,900 rpm
Barrels: 7-barrel (progressive RH parabolic twist, 24 grooves)
Caliber: 30 mm
Designer: General Electric
Effective firing range: 4,000 feet (1,220 m)
Feed system: Linkless feed system
Length: 19 ft 10.5 in (6.06 m) (total system); 112.28 in (2.85 m) (gun only)