Product DescriptionThe FN AR-15 Hammer Forged Barrel is built for demanding use with FN's proprietary high-grade Chrome Moly Vanadium (CMV) steel and a cold hammer forged construction inspired by FN machine gun barrel manufacturing. Each barrel is Magnetic Particle tested for quality control, then finished with a corrosion-resistant phosphate coating. A chrome-lined bore and chamber help resist corrosion and heat erosion for longer service life and more reliable chambering and extraction. Designed for a carbine-length gas system, it also features an M4-style feed ramp and barrel extension to promote consistent feeding in AR-15 pattern rifles.Product Highlights Cold hammer forged (CHF) CMV steel barrel for strength, durability, and long-term performance Chrome-lined chamber and bore to resist corrosion and reduce heat erosion for extended barrel life Magnetic Particle (MP) tested to help ensure the barrel is free of micro-stresses and flaws M4-style feed ramps and barrel extension for reliable feeding in AR-15 platforms Carbine-length gas system with phosphate finish for dependable function and corrosion resistanceSpecs Brand: FN Manufacturer Part Number: 36420 UPC: 845737005115 Platform Fit: AR-15 Caliber/Chamber: 5.56x45mm NATO Barrel Length: 14.70 in Gas System Length: Carbine Construction: Cold Hammer Forged Barrel Steel: Chrome Moly Vanadium (CMV) Bore/Chamber: Chrome lined Quality Test: Magnetic Particle tested Feed Ramps: M4 style Finish: Black phosphate / manganese phosphate Twist Rate: 1:7 RH Muzzle Threads: 1/2x28 Gas Block Journal Diameter: 0.750 inDisclaimer: 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.