The weapon is a self-powered, gas-operated variant of the M134 Minigun.
[1] It fired over 3000 rpm but was not put into production.
[citation needed] The XM133 is a gas-operated machine-gun.
It is nearly identical to the M134 but has barrels with ports that align with the piston drive in the center of the barrel cluster.
This article relating to machine guns is a stub.