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Minigun
The Vulcan minigun is an updated version of the old Gatling Gun (famous from many old western movies).
Rather than having a someone crank the barrels round by hand (in the manner of an organ grinder)the minigun has an electric motor which gives the weapon an astonishing rate of fire (5000-6000 rounds per minute)
Now manufactured by Dillon Aero as the MK44 Minigun, It is now used by the Royal Navy for protection against 'speedboat suicide bombers' etc.