Sorry i also typod this. This is an M2 not an M4. The plug is installed and no other modifications. The 3rd shell always gets hung up. If i pull back the bolt and release it will chamber the round. I have completely disassembled and lubricated everything. It's always the 3rd round.
Thanks!
I am having problems with my M4. It always seems to be the 3rd round doesn't fully load. It gets caught in the process. Would this be a problem with the spring or should i look at something else?