I am having the same problem with Armalite. First 5 rounds trough a never fired rifle, round would look like it was pulled back and shoulder of the shell was stopped at entrance to the chamber. Took the rifle apart and lubed it until it was literally dripping. First round after that had an empty stovepipe. A few rounds after that neck of empty cases were caught on ejection port edge. After ten round cases were getting ejected but next round was not be picked up and empty magazine was holding bolt back. So far I've put 20 rounds of IMI 175 grain Match through it and have it zeroed. Every part of this rifle seems extremely tight and maybe it just needs to wear in? Was thinking it is under gassed or buffer spring is to strong.
