<p><strong>Barrel</strong>: 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 Palmetto State Armory7" Lightweight Hex Full Picatinny M-Lok Free Float Rail and a birdcage style A2 flash hider. </p> <p><strong>Upper</strong>: Billet 6061-T6 Slick side AR upper is hard coat anodized black for durability. These upper receivers are made for us right here in the USA.</p> <p><strong>Bolt Carrier Group</strong>: Gen 4 Hybrid 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. </p> <p><strong>Lower:</strong> Forged 7075 T6 aluminum and then hard coat anodized, these lowers are purpose-built to accept 9mm Glock®-style magazines. Designed to work with PSA's new 9mm Hybrid uppers. The lower is assembled with a Palmetto State Armory MOE SBA3 lower build kit with a Magpul MOE Grip, PSA 6 position buffer tube, and SBA3 Adjustable Brace. <strong> Does not include last round bolt hold-open feature.</strong></p>