CUSTOM PAINTED ITEMS FROM PSA CUSTOM MAY HAVE BLEMISHES AND/OR DIFFERENCES FROM PICTURE Barrel: 16" Chrome-moly vanadium steel barrel Chambered in 5.56 NATO with a 1/7 twist. The barrel is Nitride treated for durability and finished off with a PSA 13" Hex Full Picatinny M-Lok Free Float Railand an A2 style flash hider. Upper: Billet 6061-T6 AR upper is Teflon-Coated in the PSA Custom paint shop for durability. These upper receivers are made for us right here in the USA. Bolt Carrier Group: Nitride treated 8620 steel bolt, with an enhanced firing pin and external 5.56 style extractor. The bolt carrier group is compatible with most aftermarket fire control groups. Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for the caliber. The finish is Teflon-coated from the PSA Custom paint shop. The Mil-spec diameter 7075-T6 buffer tube is hard-coat anodized with 6 adjustment positions and is fitted with a MOE Carbine Stock, Magpul grip, and PSA Custom 3.5 lb FlatBow Trigger. The Palmetto State Armory Custom Series line of accessories, components, and firearms are designed to give you the tactical or competitive advantage when you need it most!