The Ballastics Advantage 8.3″ .300 Blackout BA Hanson Pistol length AR 15 Performance Series Barrel with LO Pro is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish. The Performance Series Barrels feature a Nickel Boron Coated M4 feed ramp extension and are HP and MPI tested. With a DRP barrel profile and .750″ gas block journal. 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 Apply. You 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 installed on a Pistol configuration firearm.