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 0.55 high when folded, 1.38 at its widest point, and weighs a scant 30 grams with hardware. Its aesthetics are derived from the MBUS Pro, but the MBUS 3 Rear 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 Rear Sight sits at standard AR-height when deployed and includes a windage adjustable, rapid-select aperture system. Product Specifications Position: Rear Sight Height above rail, stowed: ~0.55 in. Width: 1.38 in. (Widest Point) Weight: 30g Compatibility: Mounts on AR10, AR15, M4, M16, M110, SR25. Windage Adjustment: ~0.5 MOA (0.606 /100m) per click with a 14.5" sight radius Windage Adjustment: ~0.4 MOA (0.439 /100 m) per click with a 20" sight radius Origin: Made in the USA