CMMG Receiver Extension MK4 Black Steel AR Platform
Buy your CMMG Carbine Reciever Extension's from BattleHawk Armory today!The CMMG AR-15 MK4 Carbine Length Receiver Extension is the perfect must have accessory for your next AR-15 build. The CMMG tube is constructed from high quality aluminum and features a hard coat anodized matte black finish.
