GAU-19
The GAU-19/A is an electrically driven, three-barrel rotary heavy machine gun that fires the .50 BMG cartridge. Wikipedia
Weight: 106 lbs.
Barrels: 3 or 6
Cartridge: .50 BMG (12.7×99mm NATO)
Designer: General Electric
Effective firing range: 1,800 m
Feed system: linkless or M9 linked belt
Length: 53.9 in. (1,369 mm)