The Magpul MBUS 3 Folding Rear Sight is the next evolution in the MBUS (Magpul Back-Up Sight) line. The MBUS 3 incorporates the best features, strengths and value of the 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. Technical Specifications Position: Rear Height above rail, stowed: ~0.55 in. Platform: AR10, AR15, M4, M16, M110, SR25 Center of aperture to top of rail: 1.41 in. WINDAGE ADJUSTMENT ~0.5 MOA (0.606”/100m) per click with a 14.5″ sight radius ~0.4 MOA (0.439”/100 m) per click with a 20″ sight radius
