Product Information

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 most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16 platform.


Made in U.S.A.



·        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 MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons

·        Protective wings shield the dual, same plane flip apertures

·        Sight can still be folded with either large or small aperture in position

·        Detent knob easily and positively adjusts windage




MBUS – Rear

·        Weight, w/ hardware: 1.3 oz.

·        Height above rail, stowed: ~0.51 in.

·        Center of aperture to top of rail: 1.42 in.

·        Length, stowed: 2.6 in.

·        Length, deployed: 1.5 in.



·        ~0.7 MOA (0.754/100m) per click with a 14.5 sight radius

·        ~0.5 MOA (0.547/100m) per click with a 20 sight radius


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