The inventor is believed to be an American. It appears to be in a caliber compatible with common revolver cartridges. The feed system is unknown, and can not be discerned in this full motion photostat. One would imagine that recoil and control would be a serious problem, and that accuracy would be greatly hampered. However, for a close-range deterrent to assault, I believe the PUGG would serve admirably, especially if faced with a small crowd of hostile natives.