Burris Signature Rimfire rings in medium will clear a Leupold 6-18x40mm so they should work just fine for the Nikon also. They come with two sets of clamps, one for 11mm and one for 3/8" dovetail.
drover
223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.
24hourcampfire.com - The site where there is a problem for every solution.
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