Our valued FLAME fluted barrel improved with QPQ and with stainless accuracy. Variable-depth fluting gives the barrel fantastic performance and an unmistakable look. Faxon Firearms barrels are the pinnacle of value. Manufactured 100% in-house from cradle-to-grave, these 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 start. 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 in Nitride and final inspected. All barrels are individually checked for headspace by precision custom hardened gauges. Faxon manufactures all our barrels in Cincinnati, Ohio under our ISO:9001 and AS:9100 quality certifications. Barrel Material: 416-R Stainless Barrel Type: Button Rifled Barrel Caliber: 5.56 NATO Barrel Twist: 1:8 Barrel Length: 16" Barrel Profile: Variable Depth Heavy "Flame" Fluted Barrel Gas System: Mid Length Inside Finish: QPQ Black Nitride Outside Finish: QPQ Black Nitride Muzzle Thread: 1/2-28 TPI (Threads Per Inch) Gas Block Diameter: .750" Gas Block Journal Length: 1.1" Barrel Extension: M4 Barrel Weight: ~1.65 Lbs Magnetic Particle Inspected! 11-degree Target Crown