CMMG AR-15 Receiver Extension Kit, Carbine - 55CA6C7

Complete your AR-15 lower build with this carbine receiver extension kit. Includes CMMG 6 position carbine buffer tube, CMMG carbine action spring, CMMG carbine buffer, castle nut, and end plate.Features: Carbine Receiver ExtensionMatte Black FinishCMMG Lifetime Warranty