Note that they're using .22LR ammunition, which has low recoil. They are also likely using subsonic ammo, which is even lower powered. Anything higher powered i

Note that they're using .22LR ammunition, which has low recoil. They are also likely using subsonic ammo, which is even lower powered. Anything higher powered is likely going to break apart plastic. I'd love to see one of these with a metal 3d printer. It would be impractical for most people to produce, but would be a cool proof-of-concept.