Earlier this week I was given this Leupold 4X RF Special scope, and it came with the rings attached that you see in these pictures. I'm going to mount it on a Ruger 10/22 using different rings; but I'm just curious as to what these rings are meant to fit. I don't recognize the mounting system, but it looks like they fit a base or rail that is about 0.400" wide. Does anyone recognize this style?