These are true AKMs vs the Century MISRs were made from Chinese MAK parts kits with Maadi receivers. This one is full Egyptian, although I don't believe these have threaded barrels.
I have a bunch od steel, Chinese and have Bulgarian circle 10 polymers. Both work great in my Chinese underfolder and Maadi. Luckily I bought mine a decade ago so they were cheap. No experience with Tapco mags.