Here's the latest motorized minigun from www.mrminigun.com
It's 34 inches long, 12" wide, and 11" high assembled.
And we say assembled, because it's a knock-down-able modular design:
it all comes apart into components with simple snap-locks on the carry frame, motor, and delinker.
The 20" steel barrels are gear-driven, with massive CNC-cut teeth over a 1.4 inch tall.
The minigun also features a safety clutch, so the barrel disengages from the drive if obstructed, without damage.
The virtually unbreakable ABS Engineering Polymer parts are all minimum 1/4 inch thick, with chembonded construction for rugged, long-life usage. More info at www.mrminigun.com