Faxon Firearms 14.5in Gunner 5.56 Nato Mid-Length Rifle Barrel 4150 QPQ Black Small. 56 Button Rifled Gunner Barrels are absolutely tops in performance weight balance and value. These AR15 Barrels by Faxon Firearms are pure government styling from the extension to the gas block including the .625in gas block journal. The Faxon Firearms 5.56 4150 Stainless Steel Gunner Barrel is fully stress relieved air-gauge tested and has an 11-degree target crown for superior accuracy. For a barrel that performs and looks great choose the Faxon Firearms 5.56 M4 Gunner Rifle Barrel. Specifications for Faxon Firearms 5.56 NATO Gunner Rifle Barrel: Manufacturer: Faxon Firearms Color: Black Nitride Finish: Nitride Fabric/Material: 4150 Steel Caliber: 5.56x45mm NATO Barrel Profile: Gunner Gas Block Journal Size-Diameter: .625 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-8 Barrel Material: 4150 Chrome Moly Vanadium Flutes: No Gun Make: AR Platform Gun Model: AR-15 Condition: New Gas Block Journal Size-Length: 1.9 in Gun Type: Rifle Features of Faxon Firearms 5.56 NATO Gunner Rifle Barrel: Barrel Material: 4150 CMV Barrel Type: Button Rifled Barrel Caliber: 5.56 Barrel Twist: 1:8 Barrel Profile: Gunner Inside Finish: Nitride Outside Finish: Nitride Muzzle Thread: 1/2-28 Barrel Extension: M4 Magnetic Particle Inspected 11-degree Target Crown Package Contents: Faxon Firearms 5.56 NATO Gunner Rifle Barrel What firearm models does the manufacturer say Faxon Firearms 5.56 NATO Gunner Rifle Barrel is compatible with? The manufacturer suggests that Faxon Firearms 5.56 NATO Gunner Rifle Barrel is compatible with AR-15Faxon Firearms 15A58M14NGQ: 14.5in Gunner 5.56 Nato Mid-Length Rifle Barrel 4150 QPQ Black Small