Homemade 20mm cannon

A 4chan user Joshua Geho built a 20mm rifle after getting appropriate paperwork approvals. It is interesting to see how this shoots
http://www.guns.com/2015/11/30/homebuild-20mm-cannon-project-defines-stout-recoil-video/

https://www.youtube.com/watch?v=GnMTkvDneTI


From: Guns.com