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 0.44 inches high when folded and 1.15 inches at its widest point. 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 sits at standard AR-height when deployed. Features: The MBUS 3 front sight includes tool-less elevation adjustments and a dual width enhanced front sight similar to the MBUS Pro Made in the USA Full featured spring-loaded flip up sight impact resistant polymer construction clamps to most MIL-STD-1913 picatinny rails