I recently cleaned my mark-ii, completely disassembling it. i took off the stock and got into every nook and cranny. Buttt i also took apart my bolt. I thought i put it back together correctly. But i guess not The shells will sometimes pull out, but will never eject properly. Often they will just stay in the chamber. I might of put the clip on backwards. Frankly I'm not sure... I figured i would ask before i tried taking int apart again.