M39 20mm revolver cannon installed on a Northrop F-5E light fighter.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
Previously:
Rheinmetall BK-5 autocannon - photos
Convair B-36 twin cannon turrets - GIF
M61 Vulcan cannon feed system - GIF
Northrop Grumman M230LF chain gun - GIF
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