Usually I just leave fixed sights alone, and compensate for what little difference usually exists.
If it's too far off, you can adjust for high or low by filing the front blade or rear notch, or have a gunsmith do it if you've never done it. Of course you have to "touch up" on a blued finish, or re-polish a stainless.
Most modern fixed sights are designed pretty good, and don't really need this procedure though.
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