Product Description Built for speed, these High Performance red dot sights will take your shooting ability to the next level. By using a single red dot as an aiming point, target acquisition is as simple as point and shoot. The unique Heads-Up-Display (HUD) design provides an unlimited field of view, while eliminating obstruction and tunnel vision common to tube style scopes. The Tactical Railway sight quickly attaches to the Picatinny rail on a Flat Top AR style rifles and carbines and is set at the correct height for co-witnessing with the weapons iron sights. From the Manufacturer Built for speed, these High Performance red dot sights will take your shooting ability to the next level. By using a single red dot as an aiming point, target acquisition is as simple as point and shoot. The unique Heads-Up-Display (HUD) design provides an unlimited field of view, while eliminating obstruction and tunnel vision common to tube style scopes. The Tactical Railway sight quickly attaches to the Picatinny rail on a Flat Top AR style rifles and carbines and is set at the correct height for co-witnessing with the weapons iron sights.