The Faxon Duty Series 10.5" Gunner 300 BLK Barreled Upper - Suppressor Ready is built for shooters who want a compact, hard-use 300 Blackout upper with the right foundation for suppression. This is a barreled upper assembly, not a complete firearm, and it is configured with a Faxon Duty Series Gunner-profile barrel, a free-float 9" M-LOK handguard, an adjustable .750" low-profile gas block, and a MuzzLok® Plan B compatible flash hider to help buyers get to a cleaner, more tunable suppressed setup faster.

300 BLK is one of the best AR cartridges for short barrels and suppressors, and 10.5" is a proven sweet spot. It keeps the platform compact and maneuverable while still delivering the versatility shooters want for both subsonic and supersonic ammunition. That makes this upper a strong choice for a dedicated suppressor host, home-defense-style build, compact hunting rifle, or general-purpose short-barreled AR setup.

At the core is the Faxon Duty Series Gunner Profile 10.5" Pistol-Length 300 BLK AR15 Barrel, manufactured from 4150 CMV steel and finished with salt bath nitride inside and out for corrosion resistance, durability, and long service life. Duty Series barrels are designed for rugged, repeatable performance and broad ammunition compatibility, making them ideal for shooters who prioritize reliability and real-world use over unnecessary complication.

This upper is also designed as part of a suppressor ecosystem, not just a standalone SKU. The included Faxon Patented Adjustable .750" 3 Screw Low Profile Gas Block gives shooters more control over gas when switching between loads, hosts, and suppressor setups. Up front, the Faxon MuzzLok® Stainless Steel Plan B Compatible Flash Hider provides a modern suppressor mounting path while preserving the compact handling buyers expect from a 10.5" configuration.

Faxon Firearms is a family-owned American manufacturer, not a reseller. Faxon launched in 2012, but the Faxon family’s machining and engineering roots go back to 1978. That heritage spans aerospace, defense, and other mission-critical industries, and it informs how Faxon designs, machines, and assembles firearms components in Greater Cincinnati, Ohio today.

Best for: suppressed AR builds, compact defensive carbines, short 300 BLK hunting setups, and buyers who want a suppressor-ready upper that can be tuned around real-world ammo and host variables.
Not for: buyers expecting a complete upper with a bolt carrier group and charging handle included, or buyers who do not want to tune gas when running suppressed.