
The M134 Minigun is a 7.62x51 mm NATO, six-barreled machine gun with a high rate of fire (2,000 to 6,000 rounds per minute). It features Gatling-style rotating barrels with an external power source, normally an electric motor. The `Mini` in the name is in comparison to designs that use a similar firing mechanism but larger shells, such as Genera.....
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http://en.wikipedia.org/wiki/Minigun

The General Electric M134 Minigun is an American external power Gatling-type action automatic machine-gun designed for use in aircraft and helicopters during the Vietnam War. The General Electric M134 Minigun is chambered for the 7.62 mm x 51 cartridge which it takes from a belt feed and fires with a cyclic rate of between 300 and 6000 rounds per m...
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http://www.probertencyclopaedia.com/browse/FMM.HTM
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