*The reflective sight can be mounted on a standard standard 20mm profile Picatinny mount base. The locking screw on the bottom makes the reflex stay put and hold zero under recoil or impact.* The Red Dot Sight has a 22x33mm reflective lens that provides an ultra-wide view to help you hit the target faster and see better when you do*The red dot reflex sight offers 4 different reticles and 7 lighting levels.The reflex sight can be mounted on a standard 20mm standard profile Picatinny mounting base. The locking screw on the bottom makes the reflex sight stand still and hold zero under recoil or impact.