FN America 10.5″ AR-15 Barrel — 5.56 NATO, 1:7 Twist

This FN America AR-15 barrel is a 10.5-inch carbine-length option manufactured from U.S.-sourced chrome moly vanadium material per MIL-B-11595E. It is button rifled and finished with a matte black phosphate (manganese phosphate) coating. The bore and chamber are chrome lined and the barrel uses an M16/Government profile with an M4-style feed ramp and carbine gas system.

Key Specifications

• The caliber is 5.56x45mm NATO (.223 Remington).
• The barrel measures 10.5 inches and is a carbine-length configuration.
• The rifling uses a 1:7 right-hand twist rate.
• The barrel material is Chrome Moly Vanadium (MIL-B-11595E).
• The bore and chamber are chrome lined for corrosion resistance and extended service life.
• The external finish is black phosphate (manganese phosphate).
• The profile is M16 / Government with M4-style feed ramps.
• The gas system is a carbine-length configuration.
• The muzzle is threaded with a 1/2×28 NFA thread pattern.
• The listed weight is 1.4 lb.

Designed and inspected to FN’s factory standards, this button-rifled, cold-formed barrel is high pressure tested and magnetic particle inspected to help ensure consistency and durability. Its combination of chrome lining, robust materials, and an M16 profile make it well suited for carbine builds where corrosion resistance, reliable feeding, and longevity are priorities. Whether assembling a compact patrol-style rifle or upgrading a range workhorse, this barrel provides the foundational quality expected from FN America.