Faxon Firearms URFAXFAC338 Upper Receiver 338 ARC Aluminum Black Anodized Receiver for AR-15

The Faxon Firearms URFAXFAC338 Upper Receiver for 338 ARC represents a purpose-built solution for operators seeking to convert or build a modern intermediate-caliber AR-15 platform. Chambered in 338 ARC, this aluminum upper receiver ships as a stripped assembly, designed to accept standard AR-15 bolt carrier groups and charging handles while accommodating the larger cartridge dimensions of the 338 ARC round.

The black anodized finish provides standard corrosion resistance expected in tactical upper receiver assemblies. At 0.74 lbs and measuring 9.7 inches in length, this upper receiver integrates efficiently into a mid-length or carbine-length build without adding unnecessary weight to the platform. The 338 ARC cartridge delivers ballistic performance between 5.56 NATO and larger rifle rounds—a compelling choice for shooters seeking enhanced range capability and terminal performance while maintaining AR-platform ergonomics and magazine compatibility within the standard 5.56 magwell form factor.

This upper receiver appeals to precision-focused shooters, hunters, and competitive marksmen building custom AR-15s in intermediate calibers. The 338 ARC configuration suits those seeking improved downrange energy and accuracy compared to 5.56, particularly for hunting applications where intermediate power and flatter trajectory are operationally relevant. As a stripped assembly, it pairs with matched lower receivers and barrel assemblies, allowing builders to customize trigger groups, stocks, and optics according to mission requirements.

The 338 ARC has gained recognition among serious shooters and tactical professionals as a practical middle ground in the AR-15 ecosystem. Faxon Firearms manufactures components to established standards, ensuring dimensional compliance with AR-pattern receivers. When building with this upper, select a barrel, bolt carrier, and magazines specifically chambered for 338 ARC to ensure reliable feeding and function.