Not sure if Im posting this in the right spot? I have a guy trying to trade me a gun and I know nothing about it. I think it may be pre ban. Not even sure what that means. Can someone ples give me a ideal of what the resale of this would be? The ser # is sp 355080 This list looks to me like it would be per ban? http://www.biggerhammer.net/ar15/ar15serial.html Ill post a picture of it Wanna kill these ads? We can help!