This Folding Rear BUIS (Back-Up Iron Sight) is compatible with MIL-spec height front AR sights. It locks down, and can be deployed with the push of a button. It is perfect for M4/AR-15 platforms with quick detach optics mounts.
Optimized for AR platform Locks into stowed position with push button actuated spring deployment Aluminum sight blade/aperture and polymer base for optimal strength to weight ratio
