This guy at work today was describing a rifle he has, thinks its WWII era, looks like an M1 carbine but shoots 3 rounds bursts if trigger squeezed once, full auto if held down. Was asking if was legal to own as it was given to him years ago, but doesn't ever mess with it. says he's not into guns. Another guy there said he didn't know of any WWII era rifles with 3 round burst. Anyone have a clue what it might be? He wants to get rid of it, what would I need if I were to get it? class III i'm guessing, or is it possibly something that is broke?