FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly 5.56mm 20" Barrel

The FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly 5.56mm 20" Barrel is an authentic reproduction of the iconic service rifle used by the U.S. military. This complete upper receiver assembly is designed for firearm enthusiasts and collectors who seek the reliability and craftsmanship associated with frontline combat hardware. It serves as a foundational component for those looking to build a clone-correct M16A4 rifle or wanting the ballistic advantages of a full-length barrel system.

At the core of this assembly is a 20-inch chrome-lined barrel chambered in 5.56x45mm NATO, which provides increased muzzle velocity for superior terminal ballistics at extended ranges. The assembly features the classic M16A4 configuration, including a fixed front sight base and a flat-top receiver designed for mounting period-correct optics or detachable carry handles. Precision-machined from high-grade materials, the bolt carrier group and receiver are built to withstand high-volume fire while maintaining consistent headspace and cycling reliability.

This upper receiver assembly is ideal for marksmen who prioritize accuracy and reliability in their shooting experience. Its integrated rail system allows for the secure attachment of tactical lights, vertical grips, and other mission-essential accessories without compromising structural integrity. Whether for competitive shooting or historical collection, this assembly meets the needs of those who appreciate the legacy of the M16A4.