TacFire Quick Release Detach 13/16 Inch High Flat Top Compact Red Dot Sight Riser TacFire Official Product .Great add-on for Red Dot sight , Reflex Sight . With this riser solidly mounts onto your flat top receiver and allows you to mount your red dot sight or reflex sight on top, via the US Forces 1913 picatinny rail using stanag rings. It has an opening underneath to allow the user to utelize their iron sights if need be. 13/16 inch high , 2.37 inches long with 5 slots for weaver / picatinny style mount with 20mm wide See through design allowing you to use your iron sights Industrial grade aluminum , solid construction with black finish , light weigth : 3 OZ New Quick Release Design (Patent Pending) , easy to attach or detach ( release )