A helicopter door gunner firing an M134 7.62×51mm NATO caliber "Minigun" in Vietnam, a hydraulically or pneumatically driven, six-barrel, air-cooled, electrically-fired Gatling-style rotary cannon which fires rounds at an extremely high rate, typically 6,000 rounds per minute.
The M134 Minigun is a 7.62 mm, six-barreled machine gun with a high rate of fire (2,000 to 6,000rounds per minute), employing Gatling-style rotating barrels with an external power source. The term “Minigun” has popularly come to refer to any externally-powered Gatling gun of rifle caliber, though the term is sometimes used to refer to guns of similar rates of fire and configuration, regardless of power source and caliber. Specifically, minigun refers to a specific model of weapon, or
The General Electric GAU-8/A Avenger is a 30 mm, hydraulically-driven seven-barrel Gatling-type rotary cannon that is mounted on the United States Air Force's A-10 Thunderbolt II. It is the largest, heaviest and most powerful aircraft cannon in the United States military. The GAU-8 was specifically designed for the anti-tank role, and delivers a very powerful round at a high rate of fire.