There are a few ways you can do this.
You can first sub a plate with a dovetail for the rear sight and bolt the RDS to that plate. Cheap and nasty.
You can run a mount off the lower frame. Kind of nasty in my book also but (big but) less loss of the dot during recoil as the slide cycles so maybe important to some.
You can find a slide that allows "melt in". The coolest and cleanest method and it'll also let you keep some irons for when the battery dies but also the hardest to pull off right.
What pistol you prefer plays a huge part. Glock and Hicappa easy. Anything else; well nigh impossible.
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