What copany made your M14 reciever? Got an XM25 reciever by any chance?
I have a Polytech M14S rifle. It is one of the 2 (Chinese and LRB) companies that sells Forged receivers other than register class III (Far and few)
The XM25 is a current military rifle, I am not 100% if any real one's were ever allowed to be sold on the civilian market(After 1989 ban)