Barrel: 8" chrome moly steel barrel. Chambered in 9mm, (9x19), with a 1/10 twist. The barrel is nitride treated for durability and finished off with a 7" PSA Lightweight MLOK Rail and a PSA OEM Flash Hider. Upper: Forged 7075 T6 aluminum AR-V slick side upper is hard coat anodized black for durability. These upper receivers are made for us right here in the USA. Bolt Carrier Group: AR-V 9mm BCG. 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: Forged 7075 T6 aluminum and then hard coat anodized, these lowers are purpose built to accept AR-V U9 and CZ Scorpion Magazines. The lower is assembled with a Palmetto State Armory MOE EPT PDW lower build kit with a Magpul Grip and SB Tactical PDW Pistol Stabilizing Brace.