Dove tail mounts are fucking dog shit. But its honestly probably the only option. I don't know of anyone doing milling for them. But someone probably would if asked lol.He just needs to buy one of these and replace his rear sight with it:
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Optic Mount Plate for Ruger® SR9®, SR9c®, SR40®, SR40c®, and SR45® Pistols
Options:gallowayprecision.com