Magpul MBUS Back-Up Folding Front Sight

$24.00 - $35.00
(40 reviews)
Current Stock:
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The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits most 1913 Picatinny-railed hand guards, 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 most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guard* and provides the same height-over-bore as standard A2 irons
  • Protective wings shield the spring-locking A2 front sight post
  • Elevation adjustment tool included, but most aftermarket A2 front sight adjustment tools may be used as well


  • Weight, w/ hardware: 1.2 oz.
  • Height above rail, stowed: ~0.51 in.
  • Length, stowed: 2.6 in.
  • Length, deployed: 1.5 in.
~1.6 MOA (1.886"/100m) per click with a 14.5" sight radius
~1.2 MOA (1.367"/100m) per click with a 20" sight radius
*NOTE: Cannot be mounted to a railed gas block due to excess heat issues. Front MBUS must be mounted to a railed fore end on the same plane as the receiver rail. Because of this the sight is also not compatible with MOE Hand Guards.


  • 4
    Great price, fasr shipping.

    Posted by Jeff on 21st Sep 2021

    Standard folding buis. Does what you need, no frills.

  • 5
    MBUS Front Sight

    Posted by Chris on 17th Aug 2021

    In Stock, Great Price, Fast Shipping, what more do you want

  • 5
    Magpul MBUS

    Posted by Amado on 18th Jul 2021

    Fast shipping ,magpul quality.

  • 5
    Great sight

    Posted by Rachelle Brown on 29th Apr 2021

    This sight is perfect for my AR. I would definitely buy again.

  • 5
    Its Magpul What else can I say?

    Posted by RodCK on 27th Mar 2021

    This was a perfect fit on my build. Co witnesses with my Red dot sight! The red dot sits ontop of front sight. I couldn't ask for more. And at a good price and fast shipping!!

  • 5
    Magpul MBESt

    Posted by Joe B on 7th Mar 2021

    Great sights will purchase more when in stock! Thank you arms unlimited for great prices and free shipping!!!

  • 5
    Great product

    Posted by Stanley Douglas on 26th Feb 2021

    I bought this sight to go on my m&p 15-22. Works perfectly

  • 5
    Great Product, Great Price, Fast Shipping

    Posted by William Hedges on 1st Jan 2021

    Super fast shipping on this great product. I love MBUS Folding Sights. Great place to buy them is here!

  • 5
    Great product

    Posted by Unknown on 23rd Dec 2020

    Great product exactly as stated, very fast shipping!