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.