PSA 18" Rifle-Length 6.5 Grendel 1/8 Nitride 15" Lightweight M-Lok Upper - With BCG & CH

Barrel: 4150 Chrome Moly Vanadium barrel chambered in 6.5 Grendel, with a 1:8 twist, M4 barrel extension, and a rifle-length gas system. The barrel is nitride treated and finished off with a PSA 15" Lightweight M-Lok free float rail, .750 adjustable gas block, and A2 flash hider.Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. These uppers are made for us right here in the USA by a mil-spec manufacturer.Bolt: Full-auto profile bolt carrier group. 9310 steel bolt, Shot Peened, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is nitride treated.