Six position Military Type III anodized, 6061 T6 aluminum civilian (commercial) buffer tube commercial diameter tube for maximum fit into the commercial stock. TracLOCK System eliminates horizontal and vertical movement of the stock on the buffer tube. Provides smooth secure stock adjustments. Eliminates the need for secondary locking mechanisms. No interference with the charging handle. No snag points. Thin Scorpion Recoil Pad. Dual sided QD attachment point. Slot for tactical sling attachment. DuPont Extreme Temperature Glass Reinforced Polymer. Manufactured in the USA. Fits most AR-15 variants. Does not fit AR-10 or .308 variants.