So I went out shooting some cheap russian ammo with my AR, and after firing about 50 rounds, it jammed up with an empty case not ejecting. It was really jammed in the barrel big time. I had to take it home, disassemble it, and use a thin rod down the front of the barrel and a rubber mallet to bump it out. My question, is this soley caused by the case or could there be something wrong with the rifle that caused the case to bulge/get stuck? It's a pretty new rifle with only a few hundred rounds fired. I measured the diameter of the case with a micrometer and it's a tiny bit bigger.