FN 36421 AR-15 5.56x45mm NATO 16″ Carbine

FN AR-15 barrels are cold hammer forged from the same proprietary high-grade Chrome MolyVanadium steel that FN uses in its machine gun barrels, engineered to withstand the rigors of sustained fully automatic fire. Each barrel undergoes Magnetic Particle testing post-forging to detect microstresses or material flaws, guaranteeing consistency and quality across every production unit. Chrome lining in the bore and chamber resists corrosion and provides protection against heat erosion, extending barrel life and ensuring dependable chambering and extraction. The M4 style feed ramps and barrel extension deliver consistent feeding reliability, while the black Phosphate finish guards against external corrosion and oxidation.