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.

• SPRING-LOADED FLIP UP SIGHT; 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
• IMPACT-RESISTANT POLYMER CONSTRUCTION; Polymer construction provides light weight and resists operational abuse.
• DETENT AND SPRING PRESSURE KEEPS SIGHT ERECT; Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.
• CLAMPS TO MOST MIL-STD-1913 PICATINNY RAILS; Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons.

Specifications:

Position: Rear
Height above rail, stowed: 0.51in
Length, deployed: 1.5in
Length, stowed: 2.6in
Weight, w/ hardware: 1.3oz
Other:
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