The Kaw Valley Precision AR-15 Pistol Mil-Spec Stock Completion Kit w/ 4.3oz Tungsten Carbine Buffer is a complete AR-15 buffer system designed to ensure smooth and reliable operation with your custom AR pistol. The mil-spec pistol buffer tube features 7075-T6 aircraft aluminum construction with a corrosion-resistant anodized finish for lasting performance in a lightweight package. The KVP™ heavy tungsten buffer offers increased reliability, reduces wear and tear, drastically reduces felt recoil, and eliminates the annoying "rattle" associated with standard carbine buffers. Plus, the KVP is manufactured to incredibly tight tolerances of +/- .005 oz. The kit includes one 14-4 PH stainless steel spring, one castle nut, and one stock end plate. Order today! Made in USA.