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Magpul® Back-Up Sight - Rear GEN 2 - IET Model #119a


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MBUS® - Magpul® Back-Up Sight - Rear GEN 2

The new MBUS (Magpul Back-Up Sight) GEN 2 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 flip apertures
• Sight can still be folded with either large or small aperture in position
• Detent knob easily and positively adjusts windage


• MBUS - Rear Gen 2
• Weight, w/ hardware: 1.3 oz.
• Height above rail, stowed: ~0.51 in.
• Center of aperture to top of rail: 1.42 in.
• Height above rail, stowed: ~0.51 in.
• Length, stowed: 2.6 in.
• Length, deployed: 1.5 in.

NEW Features for GEN 2

• Reduced size for greater optics compatibility (folds to a profile of only approximately a half-inch)
• Both small and large apertures are on the same plane

  • Model: IET Model #119a
  • Shipping Weight: 0.12lbs
  • Manufactured by: Magpul