So I have an atrius SS I would like to make work with my AR9. I have a CMC 95503 trigger, which passes the sniff test without the upper on. Issue I'm having is the bolt won't charge all the way, feels like the lever gets jammed up on the bcg. My BCG is a stern defense bu9 nib echo with a jp captured recoil spring. I suspect the area circled in picrel is the culprit.
My question is, does this seems like a correct diagnosis, and would modification of that area interfere with my fostech echo (which this bolt was designed to accommodate)?