I had both a k3 and a k 4 ElPaso weaver on my Ruger 250 rsi and they looked good. They are the only solution I know if you want to blue a scope as they have steel or Uber. Most others have alloy tubes and blue is not much of an option . On my other rsi i used used a gloss leupold. You may prefer a matte which would look fine. A modern blued scope is going to be tuff to find though weaver did do a limited annaversary of the k4 several years ago with a steel tube.
