The Faxon Firearms Faxon FXURGD55616GA15CSR Duty 556 16 SR Upper is a complete AR-15 upper receiver group built around Faxon’s proven 16" Duty Series Gunner barrel. Featuring a suppressor-ready configuration with an adjustable gas block and MuzzLok Plan B–compatible flash hider, this upper is engineered for smooth cycling and dependable performance with 5.56x45mm NATO ammunition.

This model arrives ready to pin on and run, including a superfinished M16 bolt carrier group, mid-length gas system, and a 15" Streamline free-float M-LOK handguard for accessory mounting. It is well suited for training, range use, and general-purpose defensive roles where reliability and controllability matter. Faxon’s in-house machining and attention to detail reflect the brand’s reputation for thoughtful engineering and consistent craftsmanship.

Key Features:

• Manufacturer: Faxon Firearms
• Model: Duty Series 16" Gunner 5.56 Complete Upper – Suppressor Ready (FXURGD55616GA15CSR)
• Caliber: 5.56x45mm NATO
• Barrel Length: 16 inches
• Barrel Description: Duty Series Gunner Profile
• Gas System: Mid-Length
• Gas Block: Faxon Patented Adjustable Gas Block
• Muzzle Device: Faxon MuzzLok Plan B–Compatible Flash Hider, 1/2x28
• Handguard: 15" Faxon Streamline Free-Float M-LOK Handguard
• Upper Receiver: Faxon Enhanced Forged Upper Receiver
• Bolt Carrier Group: Faxon Superfinished M16 BCG (Nitride)
• Charging Handle: Mil-Spec
• Receiver Finish: Black
• Receiver Material: Aluminum
• Twist Rate: 1:8 inches