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.Caliber Or Gauge: 300 AAC Blackout/Whisper (7.62X35mm)Length: 8.30"Model: AR BarrelTwist: 1:7"Sights: NoneBore Type: RifledFinish: QPQ Corrosion ResistantType: All PurposeBarrel Type: BA Hanson Pistol LengthAmmo Type: TacticalBarrel Features: Low Profile