I raided my shop. I found a bolt carrier. It's a full auto but it's chrome and my look cool in the new 20" I built. SO....IF I find a bolt, firing pin, retaining pin and the other assorted parts I may be ok. I have a bunch of spares in a box, but, go figure, I can't find it for the life of me. Somewhere in my unheated shop hidden among thousands of motorcycle parts I spent the last hour searching though and I'm now freezing. I think I had an MP marked bolt complete but I think I remember giving it away a couple years ago (like a moron) to my former spotter who whined and begged for it to finish a rifle he had.