Magpul MBUS Rear Flip-Up Sight — ODG, Picatinny

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.