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The MBUS (Magpul® Back-Up Sight) is an affordable, folding back-up sight designed for firearms with a 1913 Picatinny rail. It can be adjusted for windage and features two flip-up apertures that are easy to activate from either side or by pressing the top. The protective wings shield the dual apertures from impact.
The MBUS Rear Sight has a spring-loaded design that allows for effortless use, and can still be folded when either the large or small aperture is in position. The detent knob is easily adjustable for precise windage settings. The sight maintains its erect position thanks to detent and spring pressure, which also ensures unobstructed folding in case of impact.
Constructed from impact-resistant polymer, the MBUS Rear Sight is lightweight yet able to withstand tough operational conditions. It clamps onto MIL-STD-1913 Picatinny/STANAG 4694 receiver rails, offering the same height-over-bore as standard A2 irons. Its rear height is 0.51 inches above the rail when stowed, and its length is 2.6 inches when stowed and 1.5 inches when deployed. With hardware, it weighs 1.3 oz., while the center of aperture to top of rail is 1.42 inches.
The MBUS Rear Sight's windage adjustment offers approximately 0.7 MOA (0.754"/100m) per click with a 14.5" sight radius and 0.5 MOA (0.547"/100m) per click with a 20" sight radius, providing precise control for accurate aiming.
Compared to other backup sights, the MBUS stands out for its efficient performance, high-quality materials, and reliable design. It delivers reliable sight functionality without sacrificing the shooter's accuracy.
