Magpul MBUS Rear Back-Up Sight - Black

Magpul MBUS Rear Back-Up Sight - Black

The Magpul MBUS Rear Sight in Black is a folding back-up sight designed for AR-15 and M16 pattern rifles. Constructed from impact-resistant polymer through an injection molding process, it provides a lightweight and durable option for users needing a secondary sighting system. The sight mounts to standard 1913 Picatinny rails and folds down when not in use, maintaining a low profile on the firearm. Its spring-loaded mechanism allows quick deployment with a simple press on either side of the base.

This rear sight features dual apertures for close- and long-range aiming and is adjustable for windage via a side dial. The polymer construction resists corrosion and minimizes weight while maintaining structural strength under normal field conditions. The Black finish provides a non-reflective surface that blends with common AR-15 furniture colors. The sight’s design ensures compatibility with most rail-equipped upper receivers configured for standard-height optics or front sights.

The MBUS Rear Sight is in new condition and has not been previously installed or used. It is manufactured in the United States and includes the complete folding sight assembly in Black color. No additional accessories or mounting hardware are required beyond the integrated clamp system, which secures directly to a Picatinny rail section for installation.