Dillon Aero M134 Gattling Gun
Dillon Aero makes the M134 Gattling Gun, which can fire 7.62mm NATO at 3,000 rounds per minute, typically fed from a 3,000 or 4,400 round magazine. They are mounted on helicopters, a number of US army vehicles, ships in the US and British fleet, and, according to this YouTube video, embedded below, Dillon Tactical Vehicles are used in the US presidential motorcade. [tmm]