XM214 was a rifle-caliber rotary-gun prototype derived from the Minigun concept.
The XM214 Microgun was General Electric's attempt to shrink the electrically driven Gatling-gun idea into a 5.56 mm weapon. It followed the larger M134 Minigun lineage but used rifle-caliber ammunition and was promoted in aircraft, vehicle, and GE Six-Pak portable configurations. The concept reached prototype and promotional stages but did not become a standard U.S. service weapon.
External power, rotary barrels, 5.56 mm ammunition, and heavy support equipment defined the design.
Technically, the XM214 used multiple rotating barrels and an external power drive to generate very high rates of fire. Public references describe 5.56x45 mm ammunition, belt/chute feeding, and variable fire rates, with the complete Six-Pak system much heavier than the bare gun. Its challenge was not raw firepower, but making power supply, ammunition load, and portability practical.
The XM214 stayed experimental and is most useful as a Gatling miniaturization case study.
Operational use remained limited because the system sat between roles: more complex than conventional infantry machine guns, but less useful for many aircraft or vehicle mounts than larger-caliber Gatling weapons. It is best treated as an experimental support-weapon concept and a useful case study in why high rate of fire alone does not guarantee adoption.
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