I bought the risers from Oberle Enterprises in Hudson Co, he sells 10 meter competition stuff.
I have had no problem with them moving from recoil.
Here is another picture that shows the adjustments, the screw on the side lets the sight slide up and down for elevation
and the screw on top lets it slide for windage.
The riser mounts with two set screws, I have it back where the back screw is at the back of the tube to get it closer to my eye
but it could be moved more forward.