Shaw Barrels AR-15 Barrel Features The Shaw Barrels HBAR profile barrel brings the newer .338 ARC cartridge to the AR-15 platform machined from 416R stainless steel for strength and corrosion resistance under repeated firing. A 1:8 inch twist rate is matched to the heavier bullet weights typically loaded in .338 ARC stabilizing them through flight for consistent accuracy at extended distances. The pistol-length gas system and 16 inch barrel length keep the overall build compact suiting AR pistols and short-barreled configurations built around this cartridge. A bead blast matte finish gives the barrel a durable low-glare exterior that resists wear from handling and field use. A 5/8x24 threaded muzzle allows the installation of a muzzle brake to manage recoil or a suppressor for reduced report both common additions on .338 ARC builds given the cartridge s recoil profile. The barrel is machined with a 30 caliber feed ramp cut and is designed around a 6.5 Grendel Type II or ARC bolt and headspace important compatibility details for builders assembling a complete upper. A dimpled gas journal at a 0.750 inch gas block diameter ensures proper gas block retention and consistent cycling. For AR-15 builders looking to add the .338 ARC cartridge to their lineup with a durable stainless steel barrel the Shaw Barrels HBAR profile is available for sale at GrabAGun. Shaw Barrels AR-15 Barrel Specifications Manufacturer: Shaw Barrels Caliber: .338 ARC Compatible Hosts: AR-15 Barrel Material: 416R Stainless Steel Barrel Finish: Bead Blast Matte Barrel Length: 16 Barrel Description: HBAR Profile Pistol Length Gas System Twist Rate: 1:8 Thread Pattern: 5/8x24 Gas Block Diameter: .750 Weight: 1.80 lbs Available At: GrabAGun