I have a 22 lr conversion kit it actually looks like a bolt carrier group with what appears to be a 5.56 shell casing permanently affixed to the bolt face. It has good bit of surface rust nothing that a little CLP and stiff nylon brush shouldn't be able to handle but it's called a Atchisson Mark II M/16 AR/15 conversion device. There is no 22 magazine with it. I was wondering if anybody knows anything about this and if it's worth anything. I don't shoot 22lr through my AR but I would be willing to trade this for some 22lr if it's worth anything.