TacFire's AR-300 Unassembled pistol build kit includes :Black parkerized barrel with a 1:7 twist rate 5/8x24 spiral fluted Krink style frowarder muzzle deviceSlim M-Lok free-float handguard; 7075-T6 billet aluminum stripped upper5.56 bolt carrier groupMil-Spec charging handle dust cover forward assist heavy buffer pistol length gas tube low profile gas blockcomplete pistol buffer tube A2 black pistol grip and lower parts kits all made in the USASteel/AluminumFinish - Black ParkerizedAR-Style