FN Barrel AR-15 Pistol 5.56x45mm 14.5" Government Contour Carbine Length Gas Port 1 in 7" Twist Hammer Forged Chrome Lined Chrome Moly Matte

The FN AR-15 5.56x45mm 14.5" Govt Contour Carbine barrel brings military-grade precision and durability to your build. FN's century-long expertise in barrel manufacturing comes through in every detail of this hammer-forged component. Whether you're assembling a short-stroke pistol upper, a compact carbine, or a specialized build, this barrel delivers the reliability and accuracy that separates quality builds from the rest.

FN manufactures this barrel using cold hammer forging and high-grade Chrome Moly Vanadium steel—the same material trusted in FN's machine gun barrels designed to withstand sustained fully-automatic fire. Every barrel undergoes Magnetic Particle testing to catch micro-stresses and flaws before it leaves the factory, ensuring consistency across production runs. The chrome-lined bore and chamber resist corrosion and heat erosion, extending barrel life and maintaining reliable chambering and extraction through thousands of rounds. M4-style feed ramps and the barrel extension guarantee smooth, consistent feeding with standard AR platform carriers and bolt groups.

The matte black Manganese Phosphate finish provides durable external corrosion protection without the reflectivity of polished steel. At 0.750" diameter at the gas block, this barrel is compatible with standard AR handguards and accessories. The 1:7 twist rate stabilizes a wide range of 5.56 and .223 projectiles, making it flexible for hunting, target work, or duty use. This is a straightforward, well-engineered component built to FN's exacting standards—no marketing hype, just solid barrel fundamentals.

Key Features

• Hammer-forged Chrome Moly Vanadium steel for accuracy and durability
• Chrome-lined bore and chamber resist corrosion and heat erosion
• Magnetic Particle tested for internal defects and micro-stresses
• M4-style feed ramps for reliable feeding
• Matte black Manganese Phosphate finish for external corrosion protection
• 0.750" diameter at gas block for standard AR accessory compatibility
• 1:7 twist rate for flexible projectile stabilization

Specifications

Frequently Asked Questions

Is this barrel compatible with standard AR-15 uppers and carriers?

Yes. This barrel accepts standard AR platform bolt carriers and uses M4-style feed ramps. The 0.750" diameter at the gas block is compatible with standard AR handguards and gas block accessories.

What's the difference between hammer-forged and button-rifled barrels?

Hammer forging compresses the steel around a mandrel under extreme force, creating a denser, more uniform grain structure. This process, combined with FN's Magnetic Particle testing, provides consistency and durability proven in military service. Button rifling removes material; hammer forging consolidates it.

Why is chrome lining important?

Chrome lining protects the bore and chamber from corrosion and heat erosion caused by firing and moisture exposure. This extends barrel life, maintains reliable chambering and extraction, and reduces maintenance demands—especially valuable in unpredictable field conditions or high-round-count use.

Will a 1:7 twist stabilize different bullet weights?

A 1:7 twist is versatile across the 5.56 spectrum. It stabilizes heavier projectiles reliably while still handling standard 55-grain loads, making it a flexible choice for hunting, target, or duty applications where ammunition selection may vary.