The Faxon Duty Series 10.5" Gunner 300 BLK Complete Upper – Suppressor Ready is built around Faxon’s enhanced forged AR-15 upper receiver and a 10.5" Gunner profile barrel. Chambered in .300 AAC Blackout, it pairs a lightweight 9" M-LOK handguard with a Plan B compatible flash hider to deliver a compact, smooth-running upper that’s optimized for suppressed shooting.

This complete upper includes a superfinished M16 bolt carrier group, adjustable low-profile gas block, pistol-length gas system, and a mil-spec charging handle, giving shooters a ready-to-run solution for their AR-15 lower. Ideal for range use, training, and defensive builds where maneuverability and control matter, it supports both supersonic and subsonic 300 BLK loads. The design reflects Faxon Firearms’ focus on practical performance, thoughtful engineering, and consistent quality.

Key Features:

• Manufacturer: Faxon Firearms
• Model: Duty Series 10.5" Gunner 300 BLK Complete Upper – Suppressor Ready (FXURGD3B105GA9CSR)
• Caliber: .300 AAC Blackout (7.62x35mm)
• Barrel Length: 10.5"
• Barrel Description: Gunner Profile, 4150 Chrome Moly Vanadium
• Gas System: Pistol Length
• Gas Block: Adjustable .750" Low Profile
• Handguard: 9" M-LOK Aluminum
• Muzzle Device: Plan B Compatible Flash Hider, 5/8x24 Threads, .375" Bore
• Upper Receiver: Enhanced Forged AR-15
• Bolt Carrier Group: Superfinished 5.56 M16, Nitrided
• Charging Handle: Mil-Spec
• Receiver Finish: Black
• Twist: 1:8"