#html-body [data-pb-style=XFE4WVS]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}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 most 1913 Picatinny rail-equipped weapons but is specifically tailored to the AR15/M16 platform. Made in the USA. Impact-resistant polymer construction provides light weight and resists operational abuse Spring-loaded flip-up sight easily activated from either side or by pressing the top Detent and spring pressure keep sight erect but allow unobstructed folding under impact, etc. Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons Protective wings shield the dual, same-plane flip apertures Sight can still be folded with either a large or small aperture in position The detent knob easily and positively adjusts windage MBUS - Rear Gen 2 Weight, w/ hardware: 1.3 oz. Height above rail stowed: ~0.51 in. Center of aperture to top of rail: 1.42 in. Length stowed: 2.6 in. Length deployed: 1.5 in.