Manufactured with American-sourced chrome moly Vanadium material adhering to Mil-B-11595E standards, FN AR15 premium button-rifled barrels undergo high pressure testing (HPT) and magnetic particle inspection (MPI). This rigorous process guarantees the absence of micro-stresses or imperfections, ensuring uniformity and excellence in each barrel leaving the factory. To enhance longevity and dependable chambering/extraction, both the bore and chamber feature chrome lining, offering resistance against corrosion and heat erosion. The inclusion of M4 style feed ramps and a barrel extension maintains consistent feeding, while the matte black Manganese Phosphate finish effectively combats external corrosion and oxidation.