I said there is some likelihood that it might be a commercial. Might or might not. The Chinese SKS's are very tricky.
The mismatched one could have been refurbished at some point in time and then used. Just semantics. The important part is that they look heavy beaters.
A couple months ago I purchased an unissued Chinese SKS in an excellent condition, all matching numbers (the receiver, buttstock, trigger guard and magazine)with a factory code /306\ which I read somewhere is more rare. So, at the moment I'm satisfied. No desire to buy one of these above.