I looked at the top of the receiver with a loupe and there appears to HAVE been something there. On the top of the receiver there were letters. all i can make out is there were two numbers maybe in the center, and below it from left to right what might be an R or D and on the far right what looks to be a G. On the barrel (right on the shoulder that touches the receiver) marked 7,9. There are no other marks on the barrel at all. There us a "U" inside the bolt release. That's really all there is.