Product DescriptionUpgrade or complete your AR-15 build with this FN 16-inch 5.56x45mm NATO barrel, built from U.S.-sourced Chrome Moly Vanadium steel to Mil-B-11595E. Each barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to help ensure consistent quality. A chrome-lined bore and chamber improve corrosion resistance, ease of extraction, and long-term barrel life, while M4-style feed ramps and barrel extension promote smooth, reliable feeding. Finished in a matte black manganese phosphate coating for external corrosion resistance, this M4-profile barrel is designed for dependable performance with a carbine-length gas system.Product Highlights 16" M4-profile AR-15 barrel chambered in 5.56x45mm NATO for versatile builds Chrome-lined bore and chamber for corrosion resistance, durability, and reliable extraction HPT and MPI tested to help ensure quality and consistency M4 feed ramps and barrel extension support smooth, consistent feeding Matte black manganese phosphate finish helps resist external corrosion and oxidationSpecs Brand: FN Manufacturer Part Number: 20100046 UPC: 845737008420 Platform: AR-15 Caliber: 5.56x45mm NATO Barrel Length: 16" Profile: M4 Rifling: Button rifled Gas System Length: Carbine Material: Chrome Moly Vanadium steel (Mil-B-11595E) Bore/Chamber: Chrome lined Testing: High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) Feed Ramps: M4 Finish: Matte black manganese phosphate Gas Journal Diameter: .750" (gas seat) Muzzle Threads: 1/2x28Disclaimer: 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.