offset sights

The rear sight is to wide and needed me to put a thick shim under it so I could tighten it and make it snug. This caused the thing to not line up correctly to sight in. A problem I haven't been able to resolve yet. My mounting rails ,front and rear are standard and measure the same. I tried reversing the two sights and the front works anywhere as it should. The rear sight is to wide and will not tighten up to both sides of the rail

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