Nice lookin rifle brother Nice lookin camo job to boot.
I agree with everything M14sRock has stated.
Not sure if you figure out what type of bbl you have. Can you identify any markings on the bbl itself?
All the Norinco OEM bbls I have seen were all chrome lined ,std contour, 7.62mm chambered 22in types with a 1 in 12 in twist rate. (Same with the Poly,s)
An excellent bbl from my dealings with them.
Any idea where the headspace is at? This might be worth checking, or having someone check it for you just for your own knowledge.
Have you noticed anything out of the norm with ejected brass? Any bulging along the sides and/or primers bulged out?
I dont bother with steel cased stuff either. ( Note: My Chins bbl M14's all like German MEN/ DAG/ Lake City and Win Q3130 the best when it comes to milsurp/Fmj.)
Norinco put out a very decent receiver. Own a few myself, and use them now as the basis of builds.