Barrel: 10.5" Chrome Moly steel phosphate coated barrel. Chambered in 300BLK AAC, with a M4 barrel extension, and a Pistol-length gas system. The barrel is finished off with an ODG PSA 9" Lightweight Hex M-Lok Free Float Rail, .750 low-profile gas block, and A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. Uppers include forward assist and dust cover. These uppers are made for us right here in the USA by a mil-spec manufacturer. Bolt: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158A(R) steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec.Lower: This stealth forged lower is quality made using 7075-T6 aluminum and is marked "MULTI" for caliber. The finish is hard coat anodized. Finished with an A2 Classic Grip, H&R HAR-15 Adjustable Pistol Stabilizing Blade, and 6 position 7075 buffer tube. The fire control group is a PSA mil-spec finished, single-stage assembly.