CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black 55BC7C3-AB. Chambered this upper group is a staple for any collection and comes ready to pair with the AR15 lower group of your choice. Specifications for CMMG Mk4 Resolute Upper...
CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black 55BC7C3-AB. Chambered this upper group is a staple for any collection and comes ready to pair with the AR15 lower group of your choice. Specifications for CMMG Mk4 Resolute Upper...