The dovetail mount from Springer or EGW will work great for a MRDS, especially on a Kadet. I had an Ultradot on my Ruger 22/45 rail so I decided to duplicate that mount on the Kadet, maybe 5 years ago. I got a universal rail kit at Academy Sports, cut a section for the top of the Kadet slide, removed the barrel, drilled and tapped the slide for the screws, installed the rail section and put an Ultradot Micro HD sight on it. Has worked perfectly for years. I took a chance on getting the rail perfectly straight and level on the slide, but did it OK using only a drill press. I used a rail section that had a lengthwise slot and I can remove the red dot and use the irons whenever I want. Zero barely changes when the red dot is put back on. I put enough rail on the gun so that I could use the older, longer Ultradot if I wanted to. That one is on my Ruger 22/45.
Joe