Update here,
Got an email back from Monty, and he said he has no problem with a refund. I am going to rethink the SBR route, and then decide most likely on an 11.5/12.5 for better reliability. No doubt Centurion Arms makes great stuff and I love their rail, I just don't want to have to second guess the upper's reliability. I think i have it narrowed to a bad bolt/extractor, but i'll let the professionals figure it out. Thanks for the help guys

