FN 36420 AR-15 5.56x45mm Carbine-Length CHF Chrome-Lined

FN AR-15 barrels are manufactured from high-grade Chrome Moly Vanadium steel using FN’s cold hammer forging process. Each barrel is Magnetic Particle tested to verify it is free of microstresses or flaws, and both the bore and chamber are chrome lined to resist corrosion and improve resistance to heat erosion. The barrel features M4-style feed ramps and a barrel extension for consistent feeding and a matte black manganese phosphate finish for external corrosion resistance. This variant is built for a carbine-length gas system and is offered for .223 Rem / 5.56x45mm NATO applications.

Key Specifications

• The chambering is .223 Rem / 5.56x45mm NATO.
• The barrel contour is a Government profile.
• The material is Cold Hammer Forged Chrome Moly Vanadium steel.
• The bore and chamber are chrome lined to help resist corrosion and heat erosion.
• The external finish is Manganese Phosphate.
• The gas system length is Carbine.
• The rate of twist is 1 in 7″ RH Twist.
• The muzzle threads are 1/2-28.
• The barrel weight is listed as 1.8 lbs.
• The barrel includes M4-style feed ramps and barrel extension for reliable feeding.

Engineered to FN’s military-grade standards, this cold hammer forged, chrome-lined barrel brings durability and consistent performance to AR-15 platforms configured for carbine-length gas systems. Its corrosion-resistant finishes and proven materials make it a practical choice for shooters who expect long service life and reliable feeding from a factory-grade barrel.