Description
The MBUS (Magpul Back-Up Sight) is a color injection molded, folding back-up rear sight designed for the AR-15/M16 family and other platforms using 1913 Picatinny rails. It provides a dual-aperture, same-plane sighting option that stows low when not in use and flips up instantly when needed. The sight is spring-loaded for rapid deployment and includes protective wings to shield the apertures. It is adjustable for windage and intended as a durable, field-ready backup to primary optics.
Key Specifications
This is a folding polymer back-up rear sight designed for reserve use.
Fits AR-15/M16 platforms and other 1913 Picatinny rail equipped weapons.
Mounts to a 1913 Picatinny rail interface for consistent positioning.
Windage adjusts at 0.50 MOA per click (with a 20-inch sight radius) and 0.7 MOA per click with a 14.5-inch sight radius as noted in the manufacturer description.
Features dual flip apertures in the same plane with protective wings.
Activation is via a spring-loaded flip-up mechanism operable from either side or the top release.
Includes a detent knob that provides positive windage adjustment.
Constructed from color injection molded polymer in Olive Drab Green.
Not compatible with railed gas blocks or MOE hand guards and cannot be mounted to a railed gas block due to excess heat concerns.
Manufactured in the USA.
Reliable and straightforward, the MBUS rear sight offers a compact, durable backup aiming solution that stays out of the way until required. Its folding design, positive detent windage, and protective wings make it practical for carrying as a co-witness or emergency sight on Picatinny-equipped AR-15/M16 setups. The polymer construction and spring-loaded flip mechanism deliver a balance of low weight and dependable function for shooters who prefer mechanical backup iron sights.
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