I have been looking for a proper thread to post this question. My Stag 4gery is the same way. No markings on the barrel at all. I was told that it is 1:9, but my question is are unmarked barrels common. The only marking on the upper at all, besides the forging mark is the F mark on the FSB. Again, I believe the components to be all Stag, but is there a sure fire way to tell?