Faxon Firearms barrels are the pinnacle of value. Manufactured in-house in Cincinnati, Ohio, Faxon barrels are fully stress relieved, air-gauge tested, and 11 degree target crowned to ensure superior accuracy. Quality is imbued into our barrels from the beginning of the manufacturing process.. We start with the best materials, either certified 4150 Mil-Spec steel or 416-R Stainless. From there, each barrel goes through a battery of tests at each operation until finished and final inspected. All barrels are individually checked for headspace with precision PTG gauges. Barrel Material: 4150 CMV Barrel Type: Button Rifled Barrel Caliber: 5.56 Barrel Twist: 1:7 Barrel Length: 14.5" Barrel Profile: M4 Barrel Gas System: Carbine Inside Finish: Chrome Outside Finish: Mag Phos Muzzle Thread: 1/2x28 Gas Block Diameter: .750" Gas Block Journal Length: 1.9" Barrel Extension: M4 Weight: 1.61 lbs Magnetic Particle Inspected! 11-degree Target Crown