AR-15 HF Barrel 18" Rifle

SKU: FN16A-A49
Manufacturer part number: 36423

FN AR­15 barrels are hammer forged using the same proprietary high­grade Chrome MolyVenadium steel used in FN’s venerable machinegun barrels produced to handle the punishment of sustained fully ­automatic fire. After forging, each barrel is Magnetic Particle tested to ensure that it is free of micro­stresses or flaws, resulting in consistency and quality in every barrel shipped from the factory. The bore and chamber are chrome lined to help resist corrosion and provide resistance to heat erosion which greatly improves barrel life and reliable chambering/extraction. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. 


  • Chrome-lined chamber and bore help resist corrosion and provide heat erosion resistance that greatly improves barrel life and reliability of chambering and extraction.
  • Mil-spec Barrel Steel - FN15 barrels are hammer forged from proprietary Chrom Moly Vanadium (CMV) steel. This is the same steel developed for their machine gun barrels, which are designed to handle the punishment of full-auto fire, and is now available to you in their AR-15 barrels.
  • Magnetic Particle (MP tested to ensure each barrel is free of micro stresses and/or cracks
  • Government Profile, built for .750 diameter gas blocks
  • 1/2 x 28" threaded muzzle
  • M4-style feed ramp and barrel extension for consistent and reliable feeding
  • Manganese Phosphate barrel finish
  • 1:7 RH twist rate
  • 5.56 Nato Chamber

WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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