thanks for the reply jimb16.it does not have the sa marking on the barrel Channel like the others I have seen. Does my stock look to have a potbelly to you? I have never held a Potbelly stock in my hand so I do not know what they look like personally, only from pictures and I can't tell if mine has one or not. It does not look to me like it does but then again I am not a carbine Guru that has studied thousands of carbines like most of you guys on here have. I may have just an ordinary M2 stock. We're all M2 stocks unmarked?