Faxon Firearms FX338A2125-U Complete Upper 338 ARC 12.50" Black Anodized Barrel

The Faxon Firearms FX338A2125-U Complete Upper in .338 ARC with 12.5" barrel delivers precision and velocity in a compact, purpose-built platform suited for patrol rifles, precision AR builds, and intermediate-range tactical applications. This complete upper assembly is engineered for shooters and operators who demand reliable performance in a modern intermediate cartridge without the weight or recoil penalty of larger magnum rounds. The .338 ARC cartridge represents a significant advancement in ballistic efficiency, offering superior velocity and energy retention compared to 5.56 NATO while maintaining magazine compatibility with standard AR platforms.

Faxon Firearms' FX338A2125-U upper is built on precision machining standards with a black anodized finish that resists corrosion and provides operational discretion in the field. The 12.5" barrel length balances muzzle velocity with maneuverability, critical for close-quarters and vehicle-mounted engagements while maintaining effective engagement distances to 300+ meters with quality ammunition. At 5.9 lbs, this complete upper keeps overall rifle weight manageable—essential for extended operations and faster target transitions. The anodized aluminum construction meets military specifications for durability under harsh environments, and the assembly includes properly headspaced and inspected components ready for immediate mounting on any AR-15 lower receiver.

Law enforcement tactical teams, military units, and civilian precision shooters benefit most from this platform's flexibility and performance envelope. Installation requires only a compatible AR-15 lower receiver and standard takedown pins—no gunsmithing necessary. The .338 ARC chambering works seamlessly with most standard AR magazines and feeding systems, making this upper an efficient upgrade path for operators transitioning from 5.56 platforms. Whether building a duty rifle, patrol carbine, or precision intermediate-range gun, the Faxon Firearms complete upper provides the reliability and accuracy you need for mission-critical applications.