I took the new ai aw 308 24" rifle back home today. Found that there is a "AINA 308 WIN" stamp on the 1 o'clock position of the barrel, but from online pictures only find the ai aw rifle have the barrel stamp on the 3 o'clock align with the receiver stamp. Is this kind of barrel stamp on my rifle common? Or the receiver thread or barrel thread is out of spec? Thanks.