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

The FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly is a remarkable piece of firearm history, crafted by FN, renowned for producing some of the most battle-proven firearms in the world. This authentic reproduction of the original M16 upper receiver assembly adheres to FN's and the U.S. military's exacting specifications, ensuring reliability and performance. Featuring a 20-inch barrel with a 1:7 right-hand twist, this chrome-lined barrel is chambered in 5.56x45mm NATO, making it ideal for both precision shooting and tactical applications. The assembly includes a complete M16-style MIL-SPEC bolt carrier group, which features a high-pressure tested and magnetic particle inspected bolt made from durable Carpenter 158 steel, ensuring longevity and resilience under rigorous use. Additionally, the upper is equipped with a Knight's Armament M5RAS quad-rail system, providing ample space for mounting accessories, enhancing versatility for any M16-style build. With its A2-style front sight and adjustable rear sight, this upper receiver assembly is designed for optimal accuracy and ease of use, making it a perfect choice for enthusiasts, collectors, and those looking to build a reliable rifle. Whether you are at the range or in the field, the FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly delivers the performance and authenticity that serious shooters demand.