This.300 blackout chambered 8" modern series barrel is machined from 4150 chrome moly vanadium steel with a qpq corrosion resistant finish and qpq coated m4 feed ramp extension.Specs- 750" gas block journal, gas system length- pistol and a drp profile.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 installed on a pistol configuration firearm.Caliber Or Gauge: .7.62x35mmLength: 8"Model: AR BarrelTwist: 1:7"Sights: NoneFinish: QPQ Corrosion ResistantType: 8" BarrelBarrel Type: Pistol LengthBarrel Features: DRP Profile