The General Electric GAU-8/A Avenger is a 30 mm hydraulically driven seven-barrel Gatling-style autocannon that is typically mounted in the United States Air Force’s Fairchild Republic A-10 Thunderbolt II.
Designed specifically for the anti-tank role, the Avenger delivers very powerful rounds at a high rate of fire.A 3D animation showing how a GAU-8 Avenger 30mm cannon system works.The GAU-8 Avenger mounted in the United States Air Force’s A-10 Thunderbolt II. Watch the video from 3D Mil-Tech:
The GAU-8 itself weighs 620 pounds (280 kg), but the complete weapon, with feed system and drum, weighs 4,029 pounds (1,828 kg) with a maximum ammunition load. Power for operating the gun is provided by twin hydraulic motors pressurized from two independent hydraulic systems. The magazine can hold 1,174 rounds.
The Avenger’s rate of fire was originally selectable, 2,100 rounds per minute (rpm) in the low setting, or 4,200 rpm in the high setting. This rate was later changed to a fixed rate of 3,900 rpm.At this speed it would take 18 seconds of sustained fire to empty the magazine.via/read more: wikipedia