Magpul® MBUS Back Up Rear Sight, Gen 3

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Magpul MBUS Back Up Rear Sight, Gen 3

The next evolution in our MBUS (Magpul Back-Up Sight) line, the MBUS 3 incorporates the best features, strengths and value of our original MBUS and MBUS Pro Sights in a feature-packed back-up sight system.

Significantly reduced in size from the MBUS, it sits at just 0.55” high when folded, 1.38” at its widest point, and weighs a scant 30 grams with hardware. Its aesthetics are derived from the MBUS Pro, but the MBUS 3 Rear Sight is constructed of our impact-resistant polymer, making it lightweight and extremely durable. Featuring the same spring-loaded technology as its predecessor, they can be deployed with an ambidextrous push-button.

The MBUS 3 Rear Sight sits at standard AR-height when deployed and includes a windage adjustable, rapid-select aperture system.

MBUS 3 Sights will be available in Black, and Flat Dark Earth


Ambidextrous push-button deployment and rapid-select rear aperture system

0.55” high when folded and 1.38” wide at widest point

Standard AR-height when deployed


Polymer construction, smaller size provides light weight and resists operational abuse



~0.5 MOA (0.606”/100m) per click with a 14.5" sight radius
~0.4 MOA (0.439”/100 m) per click with a 20" sight radius



  • 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 MIL-STD-1913 Picatinny/STANAG 4694 receiver 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


  • Weight, w/ hardware: 30g
  • Height above rail, stowed: ~0.55 in.
  • Length, deployed: 1.41 in.

Made in the U.S.A.