FN AR-15 14.7-inch 5.56 NATO M4 Carbine Chrome-Lined Barrel

This FN America / FN Herstal AR-15 barrel is a 14.7-inch, carbine-length option built to production standards for reliability and service life. It is button rifled and cold hammer forged from chrome-moly vanadium material per Mil-B-11595E, with a chrome-lined bore and chamber to resist corrosion and heat erosion. The barrel uses M4-style feed ramps and a carbine-length gas system for consistent feeding in M4-profile uppers. The exterior is finished in matte manganese phosphate to resist external corrosion.

Key Specifications

• This barrel is chambered for .223 Rem / 5.56 NATO.
• The barrel length is 14.7-inch and uses a carbine-length gas system.
• The barrel profile features M4-style feed ramps and an M4 profile extension.
• The bore and chamber are finished with a chrome-lined treatment.
• The external finish is Manganese Phosphate.
• Manufacturing material is Chrome Moly Vanadium per Mil-B-11595E.
• This barrel is button rifled and cold hammer forged.
• Each barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI).
• The twist rate is 1 in 7″ RH and the NFA thread pattern is 1/2×28.

Purpose-built for dependable, service‑grade performance, this FN AR-15 14.7-inch barrel combines durable materials, factory inspection, and feature sets that suit range use, duty rifles, and general-purpose AR platforms. Its chrome-lined bore and manganese phosphate finish help extend service life and ease maintenance while the M4 profile and carbine gas system support reliable feeding in standard AR configurations.