Product Description The FN AR-15 16" Button Rifled Barrel in 5.56x45mm NATO is a premium, military-specification replacement barrel built to deliver uncompromising reliability and long service life. Manufactured from U.S.-sourced Chrome Moly Vanadium steel in accordance with Mil-B-11595E standards, this M16-profile barrel features a carbine-length gas system and a 1:7 twist rate optimized for stabilizing a wide range of 5.56 projectiles. The bore and chamber are chrome lined to resist corrosion and heat erosion, greatly extending barrel life and ensuring consistent chambering and extraction. M4-style feed ramps paired with a precision barrel extension promote smooth, reliable feeding, while the matte black Manganese Phosphate finish protects the exterior against oxidation and corrosion. Before leaving the factory, every barrel is subjected to High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI) to confirm it is free from microstresses or defects, guaranteeing the consistency and quality FN is known for worldwide. Product Highlights Military-Grade Chrome Moly Vanadium Construction: Manufactured from U.S.-sourced material per Mil-B-11595E for superior strength, toughness, and long-term reliability. Chrome Lined Bore and Chamber: Exceptional resistance to corrosion and heat erosion significantly extends barrel life and promotes reliable extraction in all conditions. High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI): Every barrel is individually tested and inspected to guarantee it is free from microstresses or structural flaws. M4-Style Feed Ramps and Barrel Extension: Ensures consistent, reliable feeding across a wide variety of 5.56x45mm NATO ammunition types. Manganese Phosphate Matte Black Finish: Corrosion- and oxidation-resistant exterior finish keeps the barrel protected under demanding field conditions. Specs Brand: FN Caliber: 5.56x45mm NATO Barrel Length: 16" Profile: M16 Rifling Method: Button Rifled Twist Rate: 1:7 Gas System: Carbine Length Exterior Finish: Black Phosphate (Manganese Phosphate) Bore/Chamber Lining: Chrome Lined Material: Chrome Moly Vanadium (Mil-B-11595E) Feed Ramps: M4 Style Muzzle: Threaded Testing: High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) MPN: 20100039 UPC: 845737008505 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>