minigun

The M134 Minigun is a 7.62 mm, six-barreled machine gun with a high rate of fire (2,000 to 6,000 rounds per minute), employing Gatling-style rotating barrels with an external power source (thus it also qualifies as a "chaingun"). 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, originally produced by General Electric.