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The XM133 Minigun is a 6-barrel machine-gun. 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.


  1. United States, 1969. p. B-2.

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