I have a set if Warne QD rings on my Ruger M77 .458 lott with a Leupold 1.5-5 VXIII and they work beautifully. I used them on safari in the Zambezi Valley and they proved to be rugged and precise. They actually go off and on and maintain zero. My rifle proved to be quite accurate and the ability to switch between express sights and a low power heavy duplex scope is an ideal situation. I have since put them on another M77RS .30-06 I have. I love the Ruger integral ring design. With the innovation of Warnes QD's it is perfect. Warne has excellent customer service as well. You must install the QD rings correctly too. It takes some time. Be sure the rings match the receiver index grooves perfectly. Tighten the lower screws first, then upper. Actually they recommend alternating front to back as well, lower left, upper right and so on. Good luck with them. I think you will really like them.