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Larry, you just remove the rear sight. https://www.jackweigand.com/sswhpmnts.html

sorry it is not drilled and tapped https://www.smith-wesson.com/firearms/model-460xvr but jack weinguard makes a adapter that replaces the rear sight jackweigand.com/sswhpmnts.html

Larry, This revolver is not drilled and tapped for optics mounting. There are adapters to replace rear sight for optic mounting, but then no sights.