The AR-15 MBUS Gen 2 Tactical Rear Sight is a low-profile, polymer backup sight that mounts on a flattop and deploys instantly with a touch.
It features a spring-loaded ambidextrous release mechanism, uses less than 1" of Picatinny rail space, and is windage-adjustable with two aperture sizes.
Compatible with AR-type rifles and any weapon with Picatinny rails, it offers the same height over bore as standard A2 iron sights.