Magpul MBUS Back-Up Folding Rear Sight

$55.05 $35.00
(You save $22.95 )
(57 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
    Flip up rear sight

    Posted by Joe Staten on 27th Nov 2021

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

  • 5
    Magpul MBUS Back-Up Folding Rear Sight

    Posted by Unknown on 26th Nov 2021

    Great sale price, shipping was expedient.

  • 4
    Great price, fast shipping.

    Posted by Jeff on 21st Sep 2021

    Standard buis , no frills.

  • 5
    Magpul MBUS

    Posted by Kenneth Krieb on 22nd Aug 2021

    Always great prices and fast, professional services. MBUS sight is perfect for my application.

  • 5
    Magpul folding rear sight

    Posted by Andrew G on 12th Jul 2021

    Having had one of these on a factory build, I was wanting one for another rifle. It took me a while to find one in black that was in stock. I had used the notify me when in stock option, but was to slow to get one that time. Signed up a second time and was able to purchase one then when they came in and at a better price than others I had seen.

  • 5

    Posted by ERICH SOILES on 22nd Jun 2021

    Great price and great service in times when it doesn't exist. Price is fantastic when everyone else is gouging

  • 5
    MBUS Back-Up Folding Rear Sight

    Posted by Gil Clark on 16th Mar 2021

    Great Product but was too expensive.

  • 5
    Rear sight

    Posted by Billy Gann on 11th Mar 2021

    Better than expected

  • 5
    Magpul the best

    Posted by Joe B on 7th Mar 2021

    Great sights! Great prices! Will continue to shop with arms unlimited fast and free shipping!