Hi everybody! I am a new member here but have always been impressed with the knowledge I have been able to obtain here so I decided to join and see if I was able to get any help for a question I couldn't find very definitive answers on. I recently bought a Norinco Mak 90 with a stamped receiver in 7.62x39. I knew it was rare because it had a flat receiver in the back and an original norinco side folding stock. The furniture is all red Bakelite or fiberglass with red scales on the side folder. It is in very good condition. However, it doesn't have a norinco stamp on the receiver or anywhere that I can find. Penned on the side is 'mak 90 621xxx' and underneath '7.62x39mm' and underneath that is 'made in china by norinco' 'csi Los Angeles CA'. It is definitely a norinco I have had lots of AKs and I can tell. But I'm not sure what model this is and what the value may be on it. I have pictures but I can't figure out how to post them but will send them if you would like! Thank you very very much for any help I can get!