The MBUS back-up sight is a low-cost, folding back-up sight.
The dual aperture MBUS Rear Sight is adjustable for windage and fits all 20mm rail equipped weapons, but is specifically tailored to the M4/M16 AEG series.
Spring-loaded flip up sight.
Easily activated from either side or by pressing the top.
For M4/M16 AEG with standard 20mm Rail.
Durable DuPont Polymer construction.