M134 Minigun A 6-barreled machine gun of pure destruction. It’s chambered in 7.62x51mm. A Navy crewman gets to have some fun with one on the water. The name “Minigun” is given because generally it’s the smallest in it’s class of multi-barrel rotary machine guns. The M61 Vulcan, the GAU-8 Avenger and the GAU-12 Equalizer are larger variants found on planes and ships. With the M134, you can at least mount it to smaller vehicles.