CMMG Receiver Extension and Stock Kit A1 Mk3, Black Polymer - 38CA964

This complete stock kit for AR-10 platforms includes a receiver extension, .308 rifle buffer assembly, action spring, and A1 rifle-length buttstock assembly in black polymer. Designed for .308 rifles, it combines with a lower parts kit to complete the lower receiver group. Made in the USA with a manufacturer's limited lifetime warranty.