The Magpul MBUS (Magpul Back-Up Sight) is a lightweight, spring loaded flip up back-up sight. The dual aperture MBUS rear sight is adjustable for windage and fits most Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16 platform. Made of a durable impact resistant polymer.
| Weight | 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. |
