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			I'm not a gunsmith but I will respond with a NO, DON'T DRILL THROUGH!!! The top strap is critical in strength and you don't want to compromise that! 
		
		
		
		
		
		
			Look into Jack Weigand (sp) mounts. I had one drilled onto my Ruger Redhawk for a Leupold/Gilmore Red Dot. It utilizes the rear sight screw hole and one other was drilled and tapped. http://www.jackweigand.com/ 
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