The MBUS (Magpul® Back-Up Sight) is a low-cost, colour injection moulded, 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.

Features:

• 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 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
  
• 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

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