MBUS 3 Back-Up Rear Sight

The Magpul MBUS 3 Rear Sight completes the MBUS 3 back-up iron sight system, offering a low-profile polymer flip-up rear sight with a rapid-select aperture system for quick transitions between close and precision shooting. Like the front sight, it features spring-loaded ambidextrous push-button deployment and folds to an incredibly low 0.55 inches, keeping your rail clear for other accessories. Tool-less windage and aperture adjustments mean you can make corrections in the field without any special tools, a significant upgrade over previous generations.