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A lot of people don't line up the dot with their sight, but rather have the dot above the sights with the sights just visible in the lower 1/4 of the aimpoint. The reson being that if your sights line up with the dot, then the sights themselves obstruct the view around the dot and the reson for having just the dot is for faster aquisiton. If you can't see whats around the dot, it makes aquisition slower, hence, there's no real advantage except in low light conditions. With the iron sights in the lower portion, you still have buis that don't require any work to use(ie flipping up the sights themselves or removing the rds), and you still have a relatively clear viewable area around the dot itself.
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