Well it's unstuck now.....either we're idiots or it really was jammed, but I've not seen a gun like this. The little bolt/handle that goes into the action bolt, slides in and out. The receiver has two holes in it, and the little bolt slides all the way through to either lock it closed or lock it open. I've never seen a gun that works like this....can anyone shed some light on it? Also if my understanding is correct, that I should somehow be able to adjust the recoil spring for the size of .22 shell I use (short vs LR etc) This gun was much before my time and while I am fairly used to auto guns and .22's I've never shot this old of a semi auto rifle to my knowledge. The only thing I've ever shot a .22 short in was a Henry lever action. Also I'm not certain that the inner magazine feed tube is the correct one for the actual magazine tube. It has an old metal follower instead of the plastic one and it just doesn't look right when it's in there. BUT I guess if it works it works, just hope it does haha.