Shop › CMMG BCG AR15 6.5GRN/6MM ARC CMMG BCG AR15 6.5GRN/6MM ARC $199.95 CMMG AR15 Bolt Carrier Group, 6.5 Grendel or 6MM ARC, Black 64BA44F Quantity: Add To Cart Added! CMMG AR15 Bolt Carrier Group, 6.5 Grendel or 6MM ARC, Black 64BA44F