We got a powerpoint at work about gunshot wounds. It was pretty inaccurate, but it had a picture of a gun I don't recognize. The powerpoint called it a "shotgun", but considering the other information, I have no idea if that is correct. It seems to have a European style bolt handle and looks to be SBR or SBS length. I tried to Google it, but when you type in "underfolder stock" all you get are AK style rifle pics.