CMMG Pistol Receiver Extension Kit 5.56 NATO / 300 AAC AR-15 Pistol Buffer Tube Kit

CMMG Pistol Receiver Extension Kit When you are thinking about building a new AR 15 pistol CMMG's Pistol Receiver Extension Kit is what you need to keep that lower receiver pistol compliant. CMMG has created the perfect kit containing an AR 15 pistol receiver extension, ambidextrous sling end plate, carbine buffer and spring. Designed to fit .300 AAC and 5.56 NATO AR pistol builds.