Uh, are you looking through the rear sight as well when you're trying to co-witness?
If it's at the same height as most other mounts, it should co-witness with the irons in the lower 3rd of the aimpoint window, not the center. You need to have a rear sight on there to co-witness, since the aimpoint is nearly parallax free, you can't just play around with it until it arbitrarily touches the front sight post.
Never mind the irons for a sec. Can you actually zero the red dot? Or is it still too high? If it's still to high, you'll probably have to shim it.
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Last edited by tunabreath; September 26th, 2009 at 14:34..
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