The AR-STONER Pistol Buffer Tube is perfect for upgrading an existing or building a new AR-15 pistol. This buffer tube is machined to strict military standards to provide an excellent fit and reliable function. The AR-STONER buffer tube is machined from 6061-T6 aluminum and given a hard coat anodized finish to withstand years of abuse. At only 3.5" long, the short buffer tube kit provides a compact package when you want to keep your weapon platform small and easily portable.