I apologize if this is a stupid question but I noticed it when I was cleaning my gun yesterday. The barrel is clearly marked 7.62x51 with a 1/10 twist but the receiver is marked .308. I know that the only real difference between a 7.62 Nato and .308 is that the .308 is a higher pressure round. I guess my questions is, is it supposed to be stamped this way? Are all DPMS rifles in .308 come with the barrel stamped with 7.62 on it?