That is fabulous accuracy with your 168 grainers grouping between 1.25" and 2.0". Isn't that amazing, a moose / bear gun for around $ 1000 ? Very well done project.
Now, did you grease up you bolt lugs, bolt raceways, op rod guide, op rod track, hammer nose ? Get 'er all lubed and then test fire... let us know if the grease helps the functioning.
This is one department where the Norinco M305 leaves the AR15's in the dust ! Still have your modularity, short carbine, but one heck of a punch at moose or bear or other large ungulates !
Very sweet project , Skooch !! Thanks for sharing !