The Blackhawk Folding Rear BUIS (Back-Up Iron Sight) is a sturdy, durable, and highly accurate foldable rear iron sight intended to meet your sighting requirements. Rigorously tested on field, this folding rear sight is calibrated for compatibility with the MIL-spec height front AR sights. This BUIS features an aluminum sight blade and aperture that is mounted to a polymer base for enhanced durability and light weight.
With a push button actuated spring deployment, the Blackhawk Folding Rear BUIS (Back-Up Iron Sight) can be flipped up into action in an instant (when your primary optic does down) and folds down for compact storage when it's not needed. This BUIS is an ideal pick for use with M4/AR-15 platforms with quick detach optics mounts.