Shop › FAXON ION ULTRALT 16" 556NATO UPPER FAXON ION ULTRALT 16" 556NATO UPPER $1,011.08 Faxon Firearms ION Ultralight, Complete Upper Receiver, Gas Operated, 556NATO, 16" Pencil Barrel, Integral 3-Port Brake, Multi-Position Adjustable Gas Block, Fits AR-15, 13" M-LOK Handguard, Matte Finish, Black, Includes Gunner Lightweight Bolt Carrier Group, Enhanced Ambidextrous Charging Handle FX5500-U Quantity: Add To Cart Added! Faxon Firearms ION Ultralight, Complete Upper Receiver, Gas Operated, 556NATO, 16" Pencil Barrel, Integral 3-Port Brake, Multi-Position Adjustable Gas Block, Fits AR-15, 13" M-LOK Handguard, Matte Finish, Black, Includes Gunner Lightweight Bolt Carrier Group, Enhanced Ambidextrous Charging Handle FX5500-U