Magpul MBUS Back-Up Folding Rear Sight

$35.00 - $55.05
(56 reviews)
Current Stock:
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The Magpul 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


  • 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.


  • 5

    Posted by Hector Ruiz on 10th Dec 2022

    Love these sights. So easy to adjust/zero in and they stay on point/target.

  • 5

    Posted by Anthony on 20th Jun 2022

    Shipping was timely and product was 100% well made in USA! Will be using arms unlimited again.

  • 5
    Better late than never…

    Posted by Adam Harris on 15th May 2022

    See above

  • 5
    Just what I ordered!

    Posted by David T on 26th Apr 2022

    Works and looks great!

  • 5
    A bit tight but it’s ok

    Posted by Gen on 24th Apr 2022

    I thought I’m going to have a problem when installing the sight to my bcm upper because it seems too tight, but with a little bit of encouragement with a rubber mallet, it went through.

  • 5
    Magpul back up folding recite

    Posted by Frank Badial on 3rd Mar 2022

    Great price very very very quick shipping. A pleasure to do business with a company like this one.

  • 5
    Works great

    Posted by Unknown on 17th Feb 2022

    These sights do what they're supposed to do. Never had a problem with any of them and at this price it's hard to beat.

  • 5

    Posted by Chris Padilla on 29th Nov 2021

    Excellent sight. Easy install. Delivered fast and secure.

  • 5
    Flip up rear sight

    Posted by Joe Staten on 27th Nov 2021

    Installed perfect and has all the tools needed to adjust. Love it...