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 is engineered for durability and weather resistance, suitable for demanding environments. Its 20-inch chrome-lined barrel and Carpenter 158 steel bolt ensure corrosion resistance and reliable performance under adverse conditions.

This assembly replicates the original M16A4 upper with precision, featuring a direct impingement rifle-length gas system and a 1:7 right-hand twist rate for stabilized bullet flight. The included Knight's Armament M5RAS quad-rail system allows for versatile accessory mounting while maintaining structural integrity.

Features

• Caliber: 5.56x45mm NATO
• Chrome-lined 20" barrel for enhanced corrosion resistance
• Complete M16-style MIL-SPEC bolt carrier group
• HPT/MPI-tested Carpenter 158 steel bolt
• Knight's Armament M5RAS quad-rail and adapter covers
• A2-style front adjustable rear sight

Specifications

• Weight: 5.61 lbs
• Barrel Length: 20 inches
• Operation: Direct impingement rifle-length gas system
• Twist Rate: 1:7 right-hand
• Color: Black
• MPN: 36320-06
• UPC: 845737017354