About
The MBUS (Magpul Back-Up Sight) is a robust and economical back-up iron sight solution. 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.
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. Note: Due to the nature of materials used, this product is not to be installed on any front rail gas block.
Postition: Rear
Height above rail, stowed: ~0.51 in.
Length, deployed: 1.5 in.
Length, stowed: 2.6 in.
Weight, w/ hardware: 1.3 oz.
Other specs: Center of aperture to top of rail: 1.42 in.
Windage Adjustment
~0.7 MOA (0.754"/100m) per click with a 14.5" sight radius.
~0.5 MOA (0.547"/100m) per click with a 20" sight radius.
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mbus rear sight this came one ar style rife i boug 
Fantastic Sight 
Quality sight. 