The Faxon Firearms Duty Series Gunner 18" 5.56x45mm NATO barrel delivers precision performance for AR-15 and M16 platforms, offering a reliable, high-accuracy option built to meet demanding duty and sport shooting needs. This 18" barrel features a 1:8" twist and is button rifled in 4150 steel, finished with a durable QPQ Black Nitride coating to resist wear and corrosion while maintaining a clean bore surface for consistent muzzle velocity and chamber performance. The Target Crown design ensures uniform bullet contact at the muzzle, contributing to tighter shot groups and dependable penetration dynamics across the 5.56 NATO spectrum. Engineered as part of Faxon Firearms Duty Series, this Gunner barrel blends rugged construction with precise dimensional tolerances, delivering balanced handling and reliable chambering for extended field use. Suitable for AR-15 and M16 configurations, it exemplifies Faxons commitment to quality steel, finish durability, and accuracy-centric engineering, making it a solid choice for shooters seeking a high-performance, long-range capable rifle barrel that harmonizes with a variety of upper builds and mission profiles.