The M61 Vulcan is a hydraulically or pneumatically driven, six-barreled, air-cooled, electrically fired Gatling-style cannon, which fires 20 mm rounds at an extremely high rate. The M61 and its derivatives have been the principal cannon armament of United States military fixed-wing aircraft for fifty years. The M61 was originally produced by General Electric, and after several mergers and acquisitions is currently produced by General Dynamics.

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