Did China make a replacement laminate stock? Or, is it an aftermarket replacement of some type? I can see only one reinforcement pin. And it looks to be a spike bayo stock, so not a Russian.
firstchoice
The Chinese laminates are wholly different than the Russian, EG, and NK laminates. Typically found on /26\ 11 mils in the 11,47x,xxx to 11,54x,xxx range. Very thin plys, maybe 40 or so:
Where the Russians only used say 20:
Quite a few other differences too (some of which you've pointed out!)