One Horse AR Barrel Features The One Horse AR Barrel is chambered in .300 AAC Blackout and cut to a 7.5 inch length making it a natural fit for a compact AR-15 pistol build running a pistol-length gas system. Constructed from 4150 steel the same alloy used in many mil-spec barrels it offers a strong balance of durability and weight for a build meant to stay light and maneuverable. A 1:7 twist rate stabilizes the full range of .300 Blackout bullet weights from lightweight supersonic loads up to heavier subsonic projectiles often run through suppressed guns. The medium barrel profile keeps weight reasonable up front while still providing enough mass to manage heat during range sessions. A 5/8x24 threaded muzzle gives builders the flexibility to add a compensator flash hider or suppressor mount depending on how the pistol will be used. At 1.05 pounds the barrel is light enough to keep an AR pistol balanced and easy to handle in close quarters. Its pistol gas system length is purpose built for the shorter barrel cycling reliably without the sharper recoil impulse some lighter gas systems can produce. For anyone assembling a dedicated .300 Blackout pistol the One Horse AR Barrel is a solid foundation for sale at GrabAGun. One Horse AR Barrel Specifications Manufacturer: One Horse Caliber: .300 AAC Blackout Gun Platform: AR-15 Twist: 1:7 Barrel Length: 7.5 Barrel Profile: Medium Muzzle Thread: 5/8x24 Material: 4150 Steel Weight: 1.05 lbs Available At: GrabAGun