Multiple Manufacturers 16" AR15/M4 Upper Receiver
This AR15/M4 pattern upper receiver assembly is built around a 16" barrel. It features a flat-top Picatinny top rail and a free-float M-LOK handguard.
Ejection port cover is installed. (Slick-side upper—no forward assist). A muzzle device is fitted. No charging handle or bolt carrier group are provided.

