The General Electric GAU-8/A Avenger is a 30 mm hydraulically driven seven-barrel Gatling-style autocannon that is primarily and most famously mounted in the United States Air Force's Fairchild Republ
The GAU-8/A Avenger's barrel and breech assembly
GAU-8 closeup
30×173 mm round next to a .30-06 Springfield for comparison
The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm caliber rounds at an extremely high r
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