Faxon Firearms Duty Series 5.56 NATO 20" 1:8 Gunner Profile AR-15 Barrel - Black Nitride

The Faxon Firearms Duty Series 20" Gunner Profile AR-15 barrel is a precision-focused 20" 5.56 NATO replacement barrel built for long-range accuracy, durability, and a more manageable front-end weight in a complete AR-15 build. Machined from certified 4150 Mil-Spec CMV steel and finished in black nitride (QPQ), this barrel delivers the wear resistance, surface hardness, and corrosion protection expected from a modern duty-grade component.

The Gunner profile provides a balanced weight distribution that keeps the muzzle end of the rifle lighter while retaining mass around the chamber and at the .625" gas block journal for improved harmonics and better heat absorption during extended strings of fire. This 20" barrel uses a versatile 1:8 twist rate well-suited to a wide range of 5.56 projectile weights for both duty and precision applications.

A rifle-length gas system softens felt recoil, slows the bolt cycle, and extends the service life of the bolt and buffer components. Like every Faxon barrel, it is button-rifled, magnetic-particle inspected, and manufactured in the USA to deliver consistent accuracy out of the box.

Whether you are assembling a precision AR-15 rifle or building a heavier-contour duty carbine that still handles well, the Faxon Duty Series 20" Gunner barrel is a no-compromise choice for the serious 5.56 shooter.