This 338 ARC chambered 12.5-inch barrel is machined from 416R Stainless Steel with a QPQ finish. Our Premium Black Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension.Hanson Series Barrels feature our proprietary BA Hanson profile and include a pinned lo-pro gas block. Hanson barrels are not designed to work with aftermarket piston kits.All NFA/ATF Rules ApplyYou may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when permanently attaching a muzzle device extending the length to 16 inchesSKUBABL338001PQLength12.5"MaterialHardened 416R Stainless SteelProfileHansonFinishQPQ Corrosion ResistantTwist Rate1/8"Gas System LengthPistolGas Block Journal.750Muzzle5/8x24 Threaded