FN America 18" Button Broached Barrel - 5.56mm NATO - Rifle-Length Gas - 1:7

FN America 18" Button Broached Barrel - 5.56mm NATO - Rifle-Length Gas - 1:7

Maximize your platform's long-range accuracy and ballistic potential with the FN America 18" Button Broached 5.56 NATO Barrel. Purpose-built for Special Purpose Rifle (SPR), designated marksman, and precision competition builds, this 18-inch barrel provides the optimal blend of higher muzzle velocity, flatter trajectories, and exceptional shot-to-shot consistency. Built around a smooth rifle-length gas system, it significantly softens the recoil impulse and lowers bolt carrier cycling speeds, allowing for rapid follow-up shots and effortless sight recovery when engaging targets at extended distances.

Every barrel is precision-machined from certified, U.S.-sourced Chrome Moly Vanadium (CMV) steel in strict compliance with military specification Mil-B-11595E. Featuring an M16 barrel contour for superior thermal mass and harmonic stability, this barrel is engineered to withstand the punishing heat of sustained strings of fire without degrading accuracy. Complete with a rugged chrome-lined chamber and bore, individual HPT/MPI testing, and a corrosion-resistant manganese phosphate finish, the FN 18-inch barrel sets the benchmark for duty-grade reliability and precision performance.

Features

18-Inch M16 Contour Profile:
Provides increased thermal mass and structural rigidity to resist heat mirage and barrel whip during extended strings of fire, optimizing muzzle velocity and harmonic stability for precision builds.

Rifle-Length Gas System:
Reduces port pressure and cycling velocities to deliver an exceptionally soft, flat recoil impulse, faster follow-up sight reacquisition, and reduced wear on internal operating components.

Mil-Spec CMV Steel Construction:
Manufactured from premium, U.S.-sourced Chrome Moly Vanadium steel per Mil-B-11595E standards, ensuring superior tensile strength and structural integrity under high-volume firing schedules.

Precision Button Broached Rifling:
Engineered to exacting bore tolerances and uniform groove depth to minimize projectile distortion and deliver match-grade accuracy downrange.

Versatile 1:7 Twist Rate:
Optimized to stabilize heavier tactical and match projectiles, including 62-grain duty, 69-grain BTHP, and 77-grain long-range precision rounds.

Chrome-Lined Chamber & Bore:
Industrial hard-chrome lining defends against corrosive combustion residue and high-temperature gas erosion, ensuring smooth extraction, effortless cleaning, and an extended service life.

Dual Proof Certified (HPT & MPI):
Individually subjected to High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI) to guarantee a flawless, stress-free micro-structure before leaving the factory.

M4 Feed Ramps & Barrel Extension:
Features a factory-installed barrel extension with precision-cut M4 feed ramps to optimize the feeding angle and ensure jam-free reliability across diverse ammunition profiles.

Matte Manganese Phosphate Finish:
Treated with a rugged mil-spec exterior finish that actively resists surface scratches, oxidation, and harsh environmental exposure while maintaining a non-reflective black finish.

Specifications