Effectively it's a rail that you attach between your rifle and scope so you Can use the same zero as another rifle. I know you can just have the adjustments recorded/memorized but this is an interesting solution
Not sure I like the mounting system. Hexhead needed on a torque wrench to do swaps. The height of the elevation adjustment knob will mean needing to swap out rings for many scopes as well to taller rings, thereby increasing scope height that much more.