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The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. Fits most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15 / M16 platform.

Made in the USA.

Spring-loaded flip up sight easily activated from either side or by pressing the top

Protective wings shield the dual, same plane flip apertures

Sight can still be folded with either large or small aperture in position

Detent knob easily and positively adjusts windage

Polymer construction provides light weight and resists operational abuse

Detent and spring pressure keeps sight erect but allows for 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