<p><strong>Barrel</strong>: 4150V chrome-moly steel phosphate barrel. Chambered in 5.56 NATO, with a 1:7 twist rate, M4 barrel extension, and a carbine-length gas system. This A2 profile barrel is finished off with a PSA 9" Lightweight M-Lok free-float rail, .750" low-profile gas block, and A2 Flash Hider.</p> <p><strong>Upper</strong>: Forged 7075-T6 A3 AR upper is hard coat anodized. These uppers are made for us right here in the USA!</p> <p><strong>Bolt</strong>: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is chrome lined and phosphate coated.</p> <p><strong>Lower</strong>: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for caliber. Finish is hardcoat anodized. 6-Position 7075-T6 buffer tube is hardcoat anodized and is fitted with an SB Tactical SBA4 Adjustable Pistol Brace, Magpul MOE+ Overmolded Grip, and Enhanced Polished Trigger (EPT). </p>#html-body [data-pb-style="62DF828BA325E"]{justify-content: flex-start; display: flex; flex-direction: column; background-position: left top; background-size: cover; background-repeat: no-repeat; background-attachment: scroll; border-style: none; border-width: 1px; border-radius: 0px; margin: 0px 0px 10px; padding: 10px;}#html-body [data-pb-style="62DF828BA326B"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}