The AR-STONER Receiver Extension Pistol Buffer Tube is a functional addition to your AR-15, LR-308 pistol build. This buffer tube is machined to strict 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. Outside diameter of 1.25" is sized for SB Tactical Braces. Note: Buffer tube only. Buffer and Buffer Spring sold separately.