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Brandon, BCM barrel nut will fit over all mil-spec diameter barrels (max of 1") and the low profile micro gas block should fit under your MCMR rail. So yes to both your questions.

Brandon, This system requires a rifle gas length (13.241 from barrel extension to shoulder) and a .750 gas seat. - We recommend using a standard barrel nut or barrel nut with similar measurements for proper fit and function of the kit. I would confirm before purchase with Adams Arms at (727) 853-0550 or (877) 461-2572 ----- or by online inquiry here : https://www.adamsarms.net/contacts/