The Faxon Duty Series 10.5" Gunner 300 BLK Complete Upper - Suppressor Ready is built for shooters who want a compact, hard-use 300 Blackout complete upper that is already configured around the realities of suppressed shooting. This is a true complete upper receiver group, including the upper receiver, barrel, handguard, gas system, muzzle device, bolt carrier group, and charging handle for a cleaner path from parts selection to finished build.

At the core is Faxon’s Duty Series 10.5" Gunner Profile 300 BLK barrel. That profile gives buyers a strong balance between weight savings and practical durability, while the compact 10.5" length keeps the platform maneuverable for range use, defensive applications, truck or backpack guns, and short suppressed builds. For 300 BLK especially, this size class remains one of the most attractive host lengths because it keeps the package short while still working well across common supersonic and subsonic use cases.

What separates this SKU from a standard complete upper is the suppressor-ready ecosystem. It includes Faxon’s patented adjustable .750" 3-screw low profile gas block, a pistol-length stainless steel gas tube, and a Faxon MuzzLok® stainless steel Plan B compatible flash hider with 5/8x24 threads and a .375" bore. That matters because suppressors do not live in isolation. The best host setups account for barrel length, gas system, muzzle mounting standard, and tuning flexibility together.

This upper also includes the Faxon Superfinished 5.56 M16 Bolt Carrier Group - Nitride and a mil-spec charging handle, making it an easy option for buyers who want a refined 300 BLK upper without turning the project into a separate parts hunt. It is a particularly strong fit for shooters building a compact AR15 lower around suppressed use, but it still works well for buyers who want a versatile 300 BLK upper first and plan to add a suppressor later.

Best for: suppressed 300 BLK builds, compact defensive carbines, range guns, and buyers who want a short complete upper with modern suppressor-mount compatibility.
Not for: buyers looking for a long-range setup, or those wanting a bare upper without tuning features already included.