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Faxon's Gov't / SOCOM 5.56 AR-15 barrel features a profile that combines the M4 and heavy profiles - it is thinner behind the gas block and thicker ahead of it to provide accuracy and manageable weight. The barrel is made from 4150 CMV carbon steel to provide a balance of accuracy and longevity. It is coated with QPQ Nitride both inside and out to ensure remarkable corrosion resistance and durability. Each barrel is stress-relieved, air-gauge tested, and checked for headspace by using precision custom hardened gauges. At each operation, the barrel has to pass a battery of tests before being inspected and allowed out. The rifle's rifling has a 1-8" twist, button rifled. It is a Gov't/SOCOM profile with a QPQ Nitride inside and outside finish. The barrel has a Muzzle Thread of 1/2"-28 tpi and a Gas Block Shoulder Diameter of .750". Its Gas Port Diameter is .081", and the Gas Block Journal Length is 1.9". It is also Magnetic Particle Inspected with an 11-degree Target Crown. All Gov’t / SOCOM 5.56 AR-15 barrels have M4-type feed ramps in the barrel extension to ensure the reliable chambering of each round.