Unlike traditional riflescopes, reflex sights have an unlimited eye relief, so there is no right or wrong place to mount your sight. Further, your target and your dot stay the same size no matter where you put your sight on your rifle. Technically, you can put it anywhere along the rail your little heart desires.

Do you need front sight with reflex sight?

They are designed for dynamic targeting and also allow sighting with both eyes open. The eye distance is irrelevant and the typical center sighting, as with a rifle scope, is no longer necessary.

What is better red dot or reflex?

A true red dot sight is a reflex sight enclosed in a tube. They offer a brighter reticle than open sights and open reflex sights provide a wider field of view and unlimited eye relief. Open sights are better for faster target acquisition and are more comfortable for aiming with both eyes open.