The bolt in my new complete LMT riflethat I got from Grant at G&R has the same ab/mp markings too. The finish on the non contacting areas look rougher than the rest of the bolt but it functions fine.
This being my first AR rifle I was suprized at the over all finish of the bcg, it will snag and hold lint from a rag when its wiped down, but like I said the contacting surfaces are smooth anf it functions fine.


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