The next evolution in our MBUS (Magpul Back-Up Sight) line, the MBUS 3 incorporates the best features, strengths and value of our original MBUS and MBUS Pro Sights in a feature-packed back-up sight system. Significantly reduced in size from the MBUS, it sits at just 0.47 high when folded, 1.38 at its widest point, and weighs a scant 25 grams with hardware. Its aesthetics are derived from the MBUS Pro, but the MBUS 3 Front Sight is constructed of our impact-resistant polymer, making it lightweight and extremely durable. Featuring the same spring-loaded technology as its predecessor, they can be deployed with an ambidextrous push-button. The MBUS 3 Front Sight sits at standard AR-height when deployed and includes tool-less elevation adjustment of a dual width enhanced front post similar to the MBUS Pro. *NOTE: Cannot be mounted to a railed gas block due to excess heat issues. Front MBUS must be mounted to a railed forend on the same plane as the receiver rail. Because of this the sight is also not compatible with MOE Hand Guards. Product Specifications Position: Front Sight Height above rail, stowed: ~0.47 in. Width: 1.38 in. (Widest Point) Weight: 25g Compatibility: Mounts on AR10, AR15, M4, M16, M110, SR25. Elevation Adjustment: ~1 MOA (1.131"/100m) per click with a 14.5" sight radius Elevation Adjustment: ~0.7 MOA (0.820"/100m) per click with a 20" sight radius Origin: Made in the USA