M61 Vulcan
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The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm × 102 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 over sixty years.
An unmounted M61A1 Vulcan with flash suppressor used in the SUU-16/A gun pod
An M61 Vulcan and the feed system for an F/A-18, on a stand
An M61 Vulcan at the Miramar Airshow
An M61 ammunition belt
Gatling gun
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The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon.
1876 Gatling gun kept at Fort Laramie National Historic Site
Mitrailleuse Gatling modèle APX 1895
A British 1865 Gatling gun at Firepower – The Royal Artillery Museum
Patent drawing for R. J. Gatling's "battery gun", 9 May 1865