Faxon ION Ultralight 16” Complete 5.56 Upper Receiver

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FX5500-U features our 14.5" Pencil Barrel with Integral Slim 3-Port Muzzle Brake which meets the NFA 16" minimum barrel length requirement, 13” Streamline Carbon Fiber Handguard, and Lightweight Bolt Carrier Group. Super light, easy shooting and ultra-rugged, the FX5500-U never compromises strength for weight. 

Pop two pins and shave more than 1 lb off the weight of your AR15!* 

Upper Receiver:

  • 5.56 NATO Pencil Barrel w/ Integral 3-Port Brake - meets NFA 16" minimum barrel length requirement 
  • Faxon Enhanced Forged Upper Receiver
  • Faxon 13" Carbon Fiber M-LOK Handguard
  • Faxon Gunner Lightweight Bolt Carrier Group
  • Multi-Position Adjustable Gas Block
  • Enhanced Ambi Charging Handle
  • Weight. 3.1 lbs



*When compared to an upper receiver with Socom profile barrel, aluminum handguard, and full mass BCG


  • 5

    Posted by Nick on May 9th 2023

    Very accurate and light I have bad shoulders and the upper being light helps alot. Also staff very helpful at Faxon…