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Update:
So I received a replacement DD 1.5 rear sight from Midway yesterday, and sure enough, the hole was a little off center to the right. This just goes to show that it really is supposed to be off center. Either that or someone is playing a cruel joke on me :)
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It's supposed to be that way according to DD.
I spoke to them yesterday regarding this after finding that mine was the same way. They did confirm that the aperture is offset to account for the rotation on the threaded spindle as it's flipped from one position to the other.
With mine sighted in the sight is sitting pretty far to the left, but not maxed out. If you look closely, you'll see that even though the sight is sitting to the left, the aperture itself is actually centered on the bore, since it was drilled offset right.
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Is this phenomenon unique only to this specific style of BUIS?
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It should be anything using the A2 aperture. If you have a Troy or have seen one picture how their aperture is not at a ninety degree angle like an A2 is.