I have a flat top Ar with a scope on it. I was watching tv a few months back and seen some sights that mount on the rail and gas block. They are off set to the right so you have to tilt your rifle to the left to use them. The show I seen them on was one of the self defense type shows. They was showing you how to use these in your home and still have a gun, with a scope, you could take to the range and use for long shots also. Does anyone know what the name of these are, and where I can find them???????????