Shop › MAG CMMG AR15 6.6 GRENDEL 10RD BLK MAG CMMG AR15 6.6 GRENDEL 10RD BLK $14.95 CMMG Magazine, 6.5 Grendel, 10 Rounds, Fits AR15/Mk4 Rifles, Black 66AFC70 Quantity: Add To Cart Added! CMMG Magazine, 6.5 Grendel, 10 Rounds, Fits AR15/Mk4 Rifles, Black 66AFC70