M39 20mm revolver cannon installed on a Northrop F-5E light fighter.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...n_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...achine_gun.jpg
Previously:
https://www.homemadetools.net/forum/...209#post161292
https://www.homemadetools.net/forum/...297#post154225
https://www.homemadetools.net/forum/...436#post150979
https://www.homemadetools.net/forum/...374#post150738
