The FN 20-100044 AR-15 barrel is manufactured from U.S. sourced Chrome Moly Vanadium material per Mil-B-11595E, with a 14.7″ barrel length, M4 profile, and 1:7 twist rate. Every barrel undergoes High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI) to eliminate microstresses and flaws, ensuring consistent quality from the factory.
Chrome lining in the bore and chamber resists corrosion and heat erosion, extending barrel life while maintaining reliable chambering and extraction. The M4 style feed ramps and barrel extension support consistent feeding, while the matte black Manganese Phosphate finish protects against external corrosion and oxidation. The carbine-length gas system delivers smooth, reliable cycling in 5.56 NATO/.223 Remington AR-15 platforms.
Backed by decades of FN military-proven engineering, this 14.7″ M4 carbine barrel suits compact, maneuverable builds without compromising accuracy or durability. It functions as a direct replacement or upgrade in standard AR-15 barrels.
