Jarred52, you have indeed got the original Chinese mag from your description. The Chinese Mak's made for import looks great on the outside, don't you agree? Yet the milling inside the Chinese Maks are a little rougher than the other ones being the Russian, East German and Bulgarians. The mags are noticeable rougher than the other varieties, and have a "hump" like the E.G.'s. I could post a pic of mine but I don't think we will be able to see the difference in MY pics, meaning I am not very proficient at good detailed pics.
Nevertheless, it sure sounds like you have a nice rig including your original Chinese mag. Does the serial # begin with "ZZ", if so those were some handsome looking guns. Enjoy it.