The AR-STONER(TM) Mil-Spec Buffer Tube is perfect for upgrading an existing or building a new AR-15 or LR-308. This buffer tube is machined to strict military standards to provide an excellent fit and reliable function. The AR-STONER(TM) buffer tube is machined from 6061-T6 aluminum and given a hard coat anodized finish to withstand years of abuse. Buffer tube only. Buffer and buffer spring sold separately. Features6-Position Adjustability6061-T6 AluminumRugged Anodized FinishMil-spec Diameter, Carbine length