Doesn't really matter. Many business men have done repark to hide out of spec parts. Won't show then. The only way to find out what's happening is to have it examined by those who do that for a living. (I don't say gunsmith because many aren't familiar with these) You have to have someone that does know M1's, not just a guy that likes guns. Your M1 doesn't fall under CMP
scale...it has that other reciever. They only use one of the big four...