Magpul MBUS Rear Flip Sight (ACU Gray)

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The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight.The dual aperture MBUS Rear Sight is adjustable for windage and fits all mil-spec 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16/M4 platform.