First I would say make sure your torque is ft pounds and not inch pounds haha it happens.
Check the mating surface of the receiver and the barrel extension make sure they are clean, I like a light film of oil but only personal preference.
Torque, break torque and re torque to 40 ft pounds if not aligned move up to no more than 80 ft pounds
If still no dice. Check with the rail manufacturer for any possible defects of the barrel nut.
Since BCM has a good track record for making outstanding products I wouldn't be lapping or modifying anything.
If any of my remarks are not comfortable for you do your homework on a gunsmith that does good work with ARs and have them do the work
Last edited by koniz; 12-16-13 at 21:09.
Reason: Forgot a few words
Former LMT test/ assembly/ machinist
Former Rock Island Arsenal / machinist
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