Convenient kit contains all the components needed to mount the buttstock of your choice on an AR-15 rifle or carbine. Perfect for stock conversions such as altering a rifle to accept a collapsible carbine stock. All parts are manufactured from the highest quality materials and held to strict dimensional tolerances for proper fit and function. Kits available for the four standard buttstock types. A1 rifle kit contains receiver extension tube, recoil buffer, recoil buffer spring, and buttstock cap screw. A2 rifle kit adds to A1 kit contents the correct buttstock spacer required for A2 rifle stocks. Carbine kits contain receiver extension, carbine recoil spring, carbine recoil buffer, lock rin Mfg: Brownells SPECS: Receiver Extension & A2 Stock Spacer �" Aluminum, anodized, matte black. Recoil Buffer �" Aluminum and steel. Spring, Lock Ring, Receiver Plate �" Steel. Kits fit standard, mil-spec AR-15/M16/M4 lower receiver and clones. Installation instructions included.