JonnieGTyler, thanks for the reply. I have checked and the letters are CM, everything else checks out with Bigghammers sight. Boltcarrier, bolt,front sight and barrel all have appropriate lettering on them.
I was wondering if I got a good deal or not. I got a 7.62 Israeli K-98 and the SP-1 for my AR-10 A-2. I hope I did ok. thanks again