Brownells offers this kit that contains both the Magpul CTR buttstock and all mounting hardwear needed for an easy installation. Includes CTR buttstock, Mil-Spec buffer tube, carbine buffer, chrome silicon recoil spring, receiver end plate and castle nut. Features a friction locking mechanism that eliminates movement between the buffer tube and buttstock for a solid "feel" when mounting rifle to shoulder. Heavy duty, spring-loaded hand lever allows fast length-of-pull adjustments. Nylon polymer body provides maximum impact and heat resistance, with molded-in reinforcements at stress points. Accepts a variety of ambidextrous sling attachment options, including web slings and si Mfg: Brownells SPECS: All MIL/SPEC kits have Brownells Buffer Tube, Recoil Chrome Silicon Spring, Receiver End Plate, D.S Arms Buffer, DPMS Lock Ring.