Actually from what Robert was saying, the XD rear is not that far off what a Sig rear is. The XD sight also fits dead flush with the rear of the slide instead of hanging over.
He bead blasted the slide, then milled out the area for the sight and re-cut the dovetail for the sight.
The trigger work he did on this is also top notch, and I would recommend his work to anyone wanting to take their Sig to another level!
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