DoubleStar AR-15 A3 Pistol Upper Receiver Assembly 300 AAC Blackout 9" 1 in 8" Twist HBAR Contour Barrel

This DoubleStar AR-15 Upper Receiver Assembly in 300 AAC Blackout is a pin-on, ready-to-shoot top end for use with any legally registered SBR or dedicated pistol AR-15 lower receiver. The Mil-Spec 9” 4140 steel black nitride coated barrel comes equipped with 1 in 8" twist rifling, M4 feed ramps, and a DoubleStar picatinny rail gas block. The muzzle is threaded with a 5/8"-24 pitch for easy installation of a silencer, and is topped off with an effective A2 flash hider. The upper features a hard coat anodized A3 flat-top receiver with a DoubleStar pistol length free-floating handguard, T-Marks, forward assist, and dust cover. The The DoubleStar Upper includes a standard AR-15 semi-auto bolt carrier, properly staked gas key with MPI bolt assembly.