MBUS AR15 / M16 Sight
This newly manufactured MBUS (Magpul ® Back-Up Sights) sight features adjustable elevation & color injection molding. It fits most 1913 Picatinny railed handguards, but is specifically designed for use on AR15 & M16 rifles. Made by Magpul in the U.S.A.
This part is found in the following schematics