Bought one too:
List of issues:
1) Plunger pin for brake not secured. Fell out. Fixed it with a new one.
2) Magazine catch retaining pin not secured. Fix with a new one. I HATE replacing those, but came out prefect.
3) Receiver cover gap with safety lever. Replacing cover.
4) East German selector lever (I believe it to be East German) didn't fit right, way too lose in front, scraping the side of the receiver in the rear. Fitted an unissued lever identical to the one I replaced. Smooth as silk now.
5) Two trigger guard rivet's not properly seated. Will have that fixed.
6) The gas block lug pin was grinded off right under the front pin on LH side. Looks terribe, and doesn't match up to the RH side. Replacing gas block with lug intact so no bigge there.
7) TERRIBLE finish that bubbles off with cleaners. Will be reparked, and coated in satin black MOLYRESIN.
8) Burrs here and there on the receiver.
9) Don't like the ARSENAL FCG, so I modified the receiver with an extra cut-out for a G2 double hook, along with a Red Star Arms retainer plate.
10) Gas tube HORRIBLY tight. Removed spring, nice snug fit, but exposed opening on LH/RH side. Will fit an unissued Polish AKM tube once gas block is replaced.
Good news was the test target is good, no cant, and the front sight is prefectly centered. I would suggest examing one IN PERSON very well before purchase.