CMMG AR-15/M4 Receiver Extension Kit - Carbine

The CMMG® AR15 6-Position adjustable Mil-Spec Receiver Extension (Buffer Tube) kit includes everything needed to complete your AR’s buffer system. Just add the mil-spec diameter carbine stock or brace of your choice. Made from aluminum with a matte black hard coat anodized finish. Kit Includes: Carbine Buffer TubeReceiver End PlateCastle NutCarbine Action SpringCarbine Buffer Compatibility: Compatible to AR-15, Mk4 and M4 Mil-Spec Lower Receiver Compatible accessories, see under this article, accessories