FN Complete Upper 556 Nato 20" Barrel 20-100366

FN 15™ Upper Receiver Assemblies are meticulously built in FN’s Columbia South Carolina manufacturing facility alongside US Military contract M4 rifles. Each upper receiver is supplied with and M16-style Bolt Carrier Assembly with properly staked gas key and Carpenter 158 Magnetic Particle Inspected (MPI) bolt, charging handle and FN’s venerable cold hammer-forged barrel.