Barrel: 8.5" 4150V Chrome Moly vanadium steel, nitride coated and chambered in 300 Blackout with a 1 in 7" twist. The pistol length gas barrel is finished off with a PSA 10.5" Lightweight Hex Full Picatinny M-Lok Free Float Rail, a low profile gas block, and a PSA Flash Flash Can.Flash Can: Palmetto State Armory's Fluted "FLASH CAN". This is a solid 6061 aluminum device that is designed to direct muzzle gases and the muzzle flash forward. Threaded 1/2x28 for 5.56 NATO. Black military-style hard anodizing. THIS DEVICE IS NOT DESIGNED TO REDUCE RECOIL, MUZZLE RISE, OR FLASH SIGNATURE. This device is designed to direct gasses and noise forward away from the shooter and enhance the weapon's appearance. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. Featuring a mil-spec finish, these uppers are made for us right here in the USA by a mil-spec manufacturer. Bolt Carrier Group: Bolt made of mil-spec shot-peened Carpenter 158 steel. The gas key is secured with grade 8 fasteners and staked per mil-spec.