they use a 7mm mag. Actually the mini gun fires 7.62X51 NATO or .308 Winchester as they are basicly the same round, .308 being the civilian designation. The 7.62X51 became the replacement for the US caliber 30.06 after NATO was formed following WWII. The name mini gun comes from the fact that the "GAU2B" is a scaled down or mini version of the Vulcan 20MM gatlin cannon used on fighter aircraft at the time. Now made by Dillon Aero the old mini has been much improved but retains the same caliber ammo.
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