FN Barrel AR-15 Pistol 5.56x45mm 14.7" Government Contour Mid Length Gas Port 1 in 7" Twist Chrome Lined Chrome Moly Matte

The FN AR-15 Pistol 5.56 NATO 14.7" Gov't Contour barrel is a premium replacement or build component engineered for shooters who demand match-grade quality and mil-spec reliability. Built from U.S.-sourced Chrome Moly Vanadium steel and manufactured to Mil-B-11595E standards, this barrel combines FN's factory quality control with features that extend barrel life and improve consistency shot after shot. Whether you're assembling a short-range pistol build, a truck gun, or a specialized training upper, this mid-length gas system barrel delivers the accuracy and durability FN is known for.

The chrome-lined bore and chamber set this barrel apart from standard commercial offerings. That lining resists corrosion from the elements and the heat cycles of sustained fire, protecting accuracy and reliability over thousands of rounds. Every barrel ships from the factory High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)—FN's way of catching micro-stresses or material flaws before they become problems downrange. The 1:7 twist stabilizes a wide range of 5.56 projectiles, from lightweight trainers to heavier match rounds. M4-style feed ramps and an integrated barrel extension ensure smooth feeding and consistent chambering, while the matte finish resists oxidation without adding weight or complexity.

This is a no-compromise upgrade or component for builders and shooters who've outgrown budget barrels but don't need a benchmark 18-inch match barrel. At 14.7 inches, it threads within pistol-legal bounds for many jurisdictions (always verify your local laws) and pairs well with pistol-length gas tubes and mid-length system builds. FN's reputation for mil-spec accuracy and durability makes this a smart choice for precision, reliability, and longevity.

Key Features

• U.S.-sourced Chrome Moly Vanadium steel, Mil-B-11595E specification
• Chrome-lined bore and chamber for extended barrel life and corrosion resistance
• High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) quality assurance
• 1:7 twist rate for stable flight across a wide range of 5.56 projectile weights
• M4-style feed ramps for reliable feeding and extraction
• Gov't contour profile balances accuracy and handling
• Matte black Manganese Phosphate finish resists external corrosion
• 14.7-inch length suitable for pistol and mid-length builds

Specifications

Frequently Asked Questions

What gas system length does this barrel require?

This barrel is configured for a mid-length gas system. Make sure your upper receiver, gas tube, and gas block are also mid-length to ensure proper cycling and reliability.

Will this barrel work with my pistol upper?

Yes, this is a 14.7-inch pistol-profile barrel. However, always verify the legality of your complete build in your jurisdiction before assembly. Barrel length, overall configuration, and any attached muzzle device can affect the legality of the final firearm.

What ammunition does the 1:7 twist stabilize?

The 1:7 twist provides stability across a wide range of 5.56 NATO projectile weights, from lightweight training rounds through heavier match-grade ammunition. This versatility makes it ideal for shooters who use different loads for different purposes.

Why is the chrome-lined bore important?

Chrome lining resists corrosion from moisture and salt exposure, and it stands up to the heat cycles of sustained or rapid fire far better than unlined steel. This extends barrel life and helps maintain accuracy and reliability over thousands of rounds.