PSA 7" Nitride 5.56 1/7 6" Lightweight M-Lok Upper - With BCG & Charging Handle - 5165447572

Barrel: 7" 4150V Chrome Moly vanadium steel, nitride treated for accuracy and durability, and chambered in 5.56 NATO with a 1 in 7" twist. Pistol-length gas barrel is finished off with an anodized PSA 6" Lightweight M-Lok Rail, a low profile gas block and an A2 Flash hider. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. These uppers are made for us right here in the USA by a mil-spec manufacturer.Bolt: Full-auto profile bolt carrier group. Milspec Carpenter No. 158A(R) steel bolt, Shot Peened, High pressure tested, Mag particle inspected, 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.