Now for something completely different....
I have seen several different red-dot sights mounted on top of the carrying handles. I have had a Holo-Site on top of a CAR for almost a year. I think it is an excellent place for a Rd dot that is sighted in for close & fast work. Most carry handle mounts allow you to have instant use of the iron sights for more precise long distance shooting.
you need to consider the purpose and role of the red dot. For me, it allows me to keep the weapon at a low mount on the shoulder, keep both eyes open, and with very little movement and no obstruction of my field of view, rapidly engage targets with excellent accuracy. I do not use the red-dot for preceision shooting at over 50 yards. In that scenario, I would drop down to a standard check weld and use the iron sights like Uncle Sam trained me to do.
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-Essayons