Description PSA 10.5″ 5.56NATO Upper The PSA 10.5″ 5.56NATO Upper features a Chrome Moly vanadium steel barrel, melonite treated for durability with a 1 in 7″ twist rate. Carbine length gas barrel is finished off with a PSA 9″ Lightweight M-Lok Rail, a low profile gas block and an A2 Flash hider. The Upper is a 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. The bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is parkerized outside, and chrome lined inside. The charging handle is included. Barrel Length: 10.5″ Barrel Profile: A2 Barrel Steel: Chrome Moly Vanadium Barrel Finish: Nitride Chrome Lining: No Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: A2 Flash Hider Receiver Material: Forged 7075 T6 Receiver Type: A3 Handguard Type: Lightweight M-Lok 9″ Free Float Rail Bolt Carrier Group Included: Yes Bolt Steel: Carpenter 158 Bolt Carrier Profile: Full-auto Charging Handle Included: Yes Overall Length: 19.5″
