The thing with manufacturing is that you will get statistically much lower defects if
1 Your materials are top quality and supplied by certified suppliers with proven paper trail.
2 Your machine tools, presses, dies, cutters, aging solutions, etc are best of breed.
3 Your follow total quality, six sigma, deming etc processes.
If only one of those categories is not best of breed and best practices, your number of known defects escalate and your number of unknown defects that slip through climb through the roof.
Now these processes are mighty expensive, but in the industry where I work in, where we deal with certified and guaranteed loss of life if one of our defects slip through, we absolutely have no choice.
Now I understand some Chinese products are top, I own an iPhone and I wear Arcteryx, but none of these items puts my life in danger if something goes wrong. (I'm not going to climb everest any time soon with my arcteryx pants where I need to place a 911 call with my iPhone.)
So long answer to say this:
You will notice a lot more defects statistically on a Norinco product as compared to a colt, dd, stag, kac. You might get a very good norc, but your chances of getting a lemon are much higher than say your chances of getting a lemon colt.
If you are really really unlucky you will buy a Norc that will wind up being a lemon, you will get frustrated and then buy a colt and that one winds up a lemon too!

It could happen...