I can't help with your problem but I hope some good advice pops up. It always does here. I have a red dot mounted on a 686-5 but of course it was drilled and tapped at factory. Weaver top mount matched up perfect. I also have another 686 that has a scope mounted in discontinued (I think) mount by Weaver that uses the rear sight mount slot and the front part of the mount actually is fitted to the gun frame between cylinder and barrel. Its a tight fit. When I first saw it, I didn't think it would be a good mount but has proven to be very secure. I am interested in drilling and tapping a couple more but now I'll wait for the experienced ones to give you the correct answer before I proceed.
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