I picked up a Draco AK47 pistol a little while back and have a couple things I want to change on it. The barrel nut was spot welded so I used a dremel to free it up. An RPK flash hider will be going on it in a couple days. I will be changing the sights and furniture at a later time.
I usually have some regular FMJ 7.62x39 sitting around but picked up four boxes of hollow points because it is illegal to hunt with FMJ in my state. I wanted to make sure they would function, loaded up a mag and tried chambering a round. CHUNK, right into the base of the barrel it went. It really isn't too uncommon for this to happen with AKs I guess. If you run a search pages of posts on forums addressing this will pop up.
As an added note everything I ground or filed I finished with 600 grit sandpaper to give it a more polished end product.