Hello from Oklahoma, I was looking for info and found it here, thanks. I'll hang out awhile if you don't mind. I'm no expert so I won't bore you with my knowledge. I may ask some questions. I sit all day at a screen so my off time is usually NOT in this chair unless I get curious about something. That said I do have what according to your chart is a 1978 (thanks again) /26\ Norinco Poly, 23114XXX K that I bought new back in the late 80's. Over time I tried a folding stock, a klugey scope and mount that never held and detachable 30 rnd. mags that were wobbly and more trouble than they were worth, all were disappointing compared to the original configuration. So I put all the original pieces back over three decades ago. The only concession I’ve made is a larger attached 20 rnd. box in place of the original 10 rnd. box. Now about that K!