Faxon Duty Series 12.5" Gunner 5.56 NATO 4150 Nitride Mid‑Length Barrel

Faxon Duty Series 12.5″ Gunner 5.56 NATO 4150 Nitride Mid‑Length Barrel

The Faxon Duty Series 12.5″ Gunner 5.56 NATO 4150 Nitride Mid‑Length Barrel delivers a powerful blend of performance, reliability, and weight savings for AR-15 builders who demand exceptional results from a compact platform. Designed for those who value mobility without compromising accuracy or strength, this barrel is an excellent choice for tactical builds, duty use, or general-purpose carbines.

Precision machined from 4150 chrome moly vanadium steel, this barrel features a QPQ nitride treatment both inside and out, greatly enhancing corrosion resistance and surface hardness. The 12.5″ length offers improved velocity over shorter barrels while remaining maneuverable for close-quarters use. Its 1:8 twist rate is optimized for stabilizing a wide range of 5.56 NATO and .223 Remington bullet weights, making it a highly versatile option for varied shooting scenarios.

The Gunner profile is a Faxon original that merges a government-profile shoulder near the chamber with a lightweight pencil contour toward the muzzle. This configuration keeps the rifle balanced and agile, especially during dynamic shooting positions or extended range time. At the muzzle, 1/2×28 threading offers compatibility with popular muzzle devices and suppressors, while an 11-degree target crown ensures consistent bullet exit and precision shot placement.

With a mid-length gas system, this barrel delivers smooth recoil impulse and reliable function while reducing wear on internal components. It features a .625″ gas block journal and is button rifled to ensure consistent lands and grooves throughout the bore. Whether you’re upgrading an existing rifle or assembling a new build from scratch, this barrel offers the dependable quality and refined engineering that defines the Faxon Duty Series.