This is a barrel I picked up at a gunshow for $110. I decided to go with a non GI barrel for my M1. The markings are "S-A-7-50". It is in good condition. It has no rust. I don't have the gagues to measure TE or ME, but I took a picture of a .30-06 cartridge in the barrel. Asing $75 USPS Priority shipped, OBO. Please e-mail or IM with any questions. Thanks!