The Faxon Match Series 12.5" 338 ARC Gunner Barreled Upper is built for shooters who want a compact, suppressor-forward setup without giving up consistency or component quality. This is a barreled upper (not a complete firearm) assembled around a Faxon Match Series Gunner-profile barrel, a purpose-built 338 ARC upper receiver with modified feed ramps, and tuned hardware to help you get to a clean, repeatable suppressed setup faster.

Platform matters with 338 ARC—especially with subsonic projectiles. This upper uses the FAXON 338 ARC Enhanced Forged AR15 Upper Receiver, featuring modified feed ramps engineered to optimize feeding and cycling of both 338 ARC subsonic and supersonic loads. That means fewer compromises when you’re tuning for suppression, magazines, and real-world ammo selection.

At the core is the Faxon Match Series Gunner Profile 12.5" 338 ARC barrel with a 1:8 twist and a pistol-length gas system. To help manage backpressure and host-to-host variation, this upper is configured with Faxon’s patented adjustable .750" low profile gas block and a pistol-length stainless gas tube—key parts of building a suppressor-ready ecosystem, not just a single SKU.

Finishing the front end is the Faxon MuzzLok® Plan B compatible flash hider with 5/8x24 threads and a .375" bore, providing a modern mount path for Plan B compatible suppressor setups while keeping the system compact and capable.

Best for: suppressed SBR builds, compact hunting rigs, and shooters who want a purpose-built 338 ARC feed path with an adjustable-gas foundation.
Not for: buyers expecting a complete firearm (this is an upper assembly) or those who do not plan to tune gas when running suppressed.