Barrel - 16.5 medium profile 5R button twist rifled. - 4150 Mil-B-11595 chrome-moly-vanadium alloy (machine gun rated). - Nitride heat-treated barrel. - 5.56x45 mm NATO (.223 Remington) chamber. - Method of Operation - Gas Piston operated rotating bolt (short stroke system). - 3-position gas system for normal suppressed and bolt-action operating modes. - C.R.O.S. (Corrosion Resistant Operating System) Nitride heat treated barrel single-piece gas block Nitride heat-treated gas plug chromed gas piston and Nickel Boron coated bolt carrier assembly (one-piece) all billet machined. - Bolt & Carrier - Nickel plated 8620 integral keyed steel bolt carrier (billet machined) heat treated/plated per MIL-SPEC. - Roller cam pin NP3 coated. - Chrome plated bolt heat-treated to MIL-SPEC. - Upper Receiver - Forged Milspec upper receiver - Black Anodized charging handle. - Handguard - Magpul MOE midlength Handguard - Weights - 4.55 - 4.75 lbs. (empty) - Manufacturing - All raw materials heat-treats platings/coatings accessories and component parts on our weapon systems are made 100% through U.S. owned and operated steel mills and manufacturers.
Determined at checkout.