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Magpul® Back-Up Sight - Front GEN 2 - IET Model #119b


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MBUS® - Magpul® Back-Up Sight - Front 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 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 MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons
• Protective wings shield the spring-locking A2 front sight post


• MBUS - Front Gen 2
• 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 also not compatible with MOE Hand Guards.

  • Model: IET Model #119b
  • Shipping Weight: 0.11lbs
  • Manufactured by: Magpul