Magpul® MBUS Back Up Front Sight, Gen 2

(23 reviews)
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Magpul MBUS Back Up Front Sight, Gen 2

The new MBUS (Magpul Back-Up Sight) GEN 2 is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits all MIL-STD-1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16/M4 platform.

Made in the 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

• Weight, w/ hardware: 1.2 oz.
• 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
• Spring-locking front sight post holds consistent elevation

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 not compatible with the MOE Hand Guard.


  • 5
    Nice, cost effective BUS

    Posted by Rob S on 8th Jan 2013

    They work

  • 5
    Great product and price

    Posted by Unknown on 3rd Jan 2013

    I own a set of these for ever at I own and for the price they can't be beat.

  • 5
    Accurate and solid

    Posted by Michael Kirk on 25th Oct 2012

    I find this sight to be accurate and solid. No complaints from me.

  • 5

    Posted by Unknown on 9th May 2012

    Lightweight. Quality construction. Inexpensive. I would buy it again.

  • 5

    Posted by JAMES FINK on 7th May 2012


  • 5
    Great for back ups.

    Posted by Brandon on 30th Apr 2012

    These a great for what they serve and there very light weight.

  • 5
    Economic and easy to use

    Posted by steven buckingham on 5th Apr 2012

    This light weight front sight is great. They even include a sight tool for adjusting the sight post. Easy to mount, easy to use, easy to shoot through(same concept at original sight post). The price was great, especially with the magpul code. Would suggest this to a friend.

  • 5
    Quality and affordability

    Posted by Darren Railey on 27th Mar 2012

    This front MBUS is truely a great product. It was easy to install and easy to adjust. Works great and at a much more affordable price then that of the top end sights.

  • 5
    Best BUIS you'll ever need ...

    Posted by A4Driver on 8th Mar 2012

    Great BUIS -- they live up to all the reviews. Remember, they are NOT National Match sights, but that's not what we're talking about .. right?? SKD Tac. shipping and COMM was way above average, too.