The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight.
The dual aperture MBUS Rear Sight is adjustable for windage and fits all mil-spec 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16/M4 platform.
•Impact resistant polymer construction provides light weight and resists operational abuse
•Spring-loaded flip up sight easily activated from either side or by pressing the top
•Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.
•Clamps to any standard mil-spec 1913 Picatinny rail and provides the same height-over-bore as standard A2 irons
•Protective wings shield the dual flip apertures
•Detent knob easily and positively adjusts windage