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To address the original question, there's another setup that uses two scopes - a magnified scope and a red dot. On AR Carbines (m4 etc) usually a red dot on the front/top RIS or a bi-level rail, and a magnified scope (w/ see-thru mount) on the carry handle.
The red dot will line up with the iron sights, giving you all the advantages of the red dot, and you still have the magnified scope for longer range engagements.
Or on some full size ARs/SR25s/SPRs/etc, a small red dot mounted on a rail atop the magnified scope's rings (I use this setup on my Match AR). Same idea. You don't wanna engage at close range with a magnified scope, you'd be dead before you properly aquired your target.
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