A red dot, regardless of whether it's a tube-type red dot scope or a tombstone-type reflex sight, is a stand-alone sighting device. It is NOT a replacement or substitute rear sight, to be used in conjunction with the existing front sight. You don't need to see the front sight through the red dot device.
If you do happen to see the front sight -- learn to ignore it, because it isn't used for sighting. A red dot sighting device works independent of any open sights. They are generally parallax-free. To aim, look through the sight move the gun until the dot covers the intended point of impact, and pull the trigger. If it doesn't hit where you were aiming, use the adjustment screws to shift the point of impact until it coincides with point of aim.
Again, a red dot is NOT a substitute rear sight.
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