The guys that would normally reply are at the PSA “gun show” today and this weekend 
– wish I could be there too, but it’s a long way from Nevada!
I am not an expert, but here is what I think.
1st, the TC-E bolt carrier is on all KS-47s now because the old one had a couple issues (I think, but am pretty sure). The TC-E is supposed to last a lot longer.
2nd, the Magpul PMags work pretty well, but most other mags could have issues – some requiring more work than others. Below is a link to some instructions to fitting AK mags (47 or 74) that worked for me, but be sure to read all the descriptions on the pictures before filing! (unlike me):
If I’m not mistaken, ProMags are not in the compatibility list for the KS-47. I saw that too late and spent a couple hour working on one of them without any luck. Had to file a lot just to get it to fit in the magwell, and, when it did fit, it fed the first cartridge but not the second.
There are a couple other threads in the KS-47 group you could read too by either searching or scrolling back. Keep us up-dated.
Edit: Forgot to mention that I had to do some minor work on 2 new magpul mags. They “fit” out of the box, but you could pull/wiggle the mags out of the magwell. After minor surgery they seem to work very well now.