Mission First Tactical BUPSWR Flip Up Rear Sight Black - AR-15

The Mission First Tactical BUPSWR (Back Up Polymer Sight, Windage Rear) is a low-profile, snag-resistant flip-up rear sight built to serve as a reliable backup iron sight on any AR-platform rifle. Molded from military-grade polymer and finished in matte black, it keeps a minimal footprint on the rail while delivering precise, repeatable adjustments when the primary optic goes down.

The BUPSWR clamps to any standard 1913 Picatinny rail and is purpose-built for the AR-15 and similar AR-platform rifles. A spring-loaded flip-up mechanism deploys the sight with the press of a button, and the shrouded housing protects the aperture from debris and impact damage while folded. The low-profile, snag-resistant design sits low enough to co-witness cleanly with most red-dot and holographic optics already mounted on the rifle.

Adjustment is simple and tool-driven. Windage is tuned in 0.25 MOA increments via a flat-head screw on the side of the housing, and the sight provides a generous 25 MOA of total elevation travel so it can be dialed in for your specific ammunition and range. The result is a lightweight, snag-free backup that adds meaningful utility to defensive, duty, or competition AR-15 builds without weighing the rifle down.