The Magpul MBUS (Magpul® Back-Up Sight) is a color injection molded, folding backup sight. These iron sights are spring-loaded for fast engagement, durable, and dependent construction. The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail-equipped weapons, but is specifically tailored to the AR15 / M16 platform.
Spring-loaded flip up sight easily activated from either side or by pressing the top
Detent knob easily and positively adjusts windage
Polymer construction provides light weight and resists operational abuse