Thanks, Tim. Also, on the front of that receiver, there is a design cut into it and it's almost like a square across the front with a divider with two recessed pieces on each side of the divider. I don't know what to do, really, because, like I said, I bought this at a gun show that concludes tomorrow and I don't know this guy. He also has a .308 but it's in synthetic, which I'm not crazy about and the receiver is blued so it's a pretty plain looking piece where this one isn't. I wish there was a foolproof way for me to know sooner than the middle of next week.