Magpul MBUS Pro Back-Up Folding Rear Sight

$104.45 $102.36
(You save $7.59 )
(45 reviews)
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Magpul MBUS Pro Back-Up Folding Rear Sight


The MBUS Pro (Magpul Back-Up Sight) is a corrosion resistant all-steel back-up sighting solution that delivers maximum functionality and strength with minimum bulk at a price that's even smaller than its size.

The dual aperture, windage adjustable Rear and no-tool, elevation adjustable Front excel in all 1913 Picatinny rail mounting applications, including rail-height gas blocks. Positive detents keep the MBUS Pro Front and Rear at standard AR sight height when deployed, and so low when they are stowed that you'll never notice them until they're needed. Narrow width Front is compatible with most IR aiming laser and light installations for the professional user.

Made in U.S.A.


  • All steel construction
  • Case hardened and finished with Melonite QPQ&trade for extreme resistance to wear and corrosion
  • Mounts on any MIL-STD-1913 Picatinny/STANAG 4694 rail
  • Windage adjustable with low-profile knob – no tools required
  • Positive detents in both the up and down positions
  • Standard AR sight height when deployed


  • Weight, w/ hardware: 1.80 oz.
  • Height above rail, stowed, at mid-point: ~0.37"
  • Length, stowed: 2.1"
  • Aperture height over rail: 1.41"
  • Small aperture dia.: 0.07"
  • Large aperture dia.: 0.19"

Windage Adjustment:

~0.5 MOA (0.566"/100m) per click with a 14.5" sight radius
~0.4 MOA (0.410"/100m) per click with a 20" sight radius


  • 3
    Back up sight

    Posted by Steve T. on 24th Dec 2022

    Good quality

  • 5
    Magpul MBUS Pro Back-Up Folding Rear Sight

    Posted by Unknown on 2nd Oct 2022

    Excellent sight/ fast shipping. I like it.

  • 5
    Magpul BUIS

    Posted by Michael on 15th Sep 2022

    Excellent product at a good price

  • 5
    The gold standard

    Posted by Josh Horne on 12th Sep 2022

    Love these sights, and at this price, you can't beat them.

  • 5
    Great experience with Arms Unlimited

    Posted by Bruce S. on 15th Aug 2022

    Spend the extra money and get these upgraded metal backup sights instead of the polymers.

  • 5
    Exactly as described

    Posted by AK on 28th Jun 2022

    Fast shipping

  • 5

    Posted by 2STROKE on 25th Jun 2022

    Low profile and gives ample access to the charging handle. Well made and consistently accurate.

  • 5
    Very good backup sight II

    Posted by East TN Gunsmith on 24th Jun 2022

    Did i mention, I really like these sights? Arms Unlimited has them for the best price.

  • 5
    Back up sight

    Posted by Kevin Breitwieser on 17th Apr 2022

    This was the first time I purchased from Arms Unlimited and WOW what an experience, they have there act together, from browsing on there website to actually have my product in hand I purchased a Magpul MBUS Pro rear sight and it was affordable and works like a charm and also was sent to me in a timely fashion, I salute you ARMS UNLIMITED keep up the good work and I highly recommend and I look forward to my next purchase with them