Faxon FX5500U Ion Upper | .223/5.56 | 16″ Barrel | 13″ M-LOK

The Faxon Firearms FX5500U Ion is a complete AR-15 upper configured around a 16-inch nitride steel pencil barrel and a lightweight 13-inch carbon-fiber M-LOK handguard. This upper includes a forged receiver, the Faxon Gunner lightweight bolt carrier group, an adjustable gas block and an ambidextrous charging handle. It is intended for shooters who want a lightweight, accurately handling upper for range training and lightweight field work such as varmint hunting or competition stages.

Product Specifications

• The caliber/cartridge is listed as .223 REM/5.56 NATO.
• The barrel length is 16 inches.
• The barrel material is steel.
• The barrel finish is nitride.
• The contour is a pencil profile for reduced weight.
• The handguard is a 13-inch carbon-fiber M-LOK design.
• The upper receiver is forged.
• The bolt carrier group is the Faxon Gunner lightweight assembly.
• The gas system features an adjustable gas block.
• The charging handle is ambidextrous.
• The overall listed weight is 3.1 lbs.
• The product is marked as AR-15 accessory: Yes.
• The external finish is described as anodized.
• The product color is black.
• The UPC is 816341024557.

This upper assembles proven Faxon components into a lightweight, serviceable package that emphasizes reduced weight and straightforward maintenance. Its pencil-profile barrel and carbon-fiber handguard make it well suited to extended range sessions and disciplines where carrying weight and quick handling matter. If you want a complete upper that balances low weight with standard AR-15 compatibility, the FX5500U Ion provides a clear, practical option.