The Minigun

The minigun is a 7.62mm multi barrel heavy machine gun. Its rate of fire is 2,000 to 6,000 rounds per minute. The minigun first appeared in the Vietnam War as a turret, or mounted on a helicopter, such as the AH-1 Cobra.

There have been many modifications to the original design of the minigun. Miniguns are still used today in combat, mostly by the US Military
Ammunition: 7.62x51mm NATO
Manufacturer: United States and many other countries
Source: http://en.wikipedia.org/wiki/Minigun