Introducing the FN AR-15 premium button rifled barrels, meticulously crafted from domestically sourced chrome moly vanadium as per Mil-B-11595E standards. Each barrel is subjected to rigorous High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI), ensuring a flawlessly performing barrel devoid of micro-stress and imperfections. With a chrome-lined bore and chamber, these barrels demonstrate remarkable resistance against corrosion and heat erosion, promising an extended barrel lifespan and consistent chambering and extraction. M4 style feed ramps and a well-matched barrel extension guarantee a uniform feeding process, while the matte black manganese phosphate finish effectively combats external oxidation and corrosion. These barrels are available in 5.56x45mm Cal, featuring a range of profiles and gas system lengths, extending from the 10.5 inches Government Carbine to the 20 inches Government Rifle. Every barrel is synonymous with factory-delivered quality and steadfast consistency.