I have two of the AOP55 1 piece mounts on springers. One is mounting a Bushnell 4200 8-32x40 on my 97K and the other a Bushell 6-24x40 on my 77K. These scopes don't have a large adjustment range so something like this is necessary.
A little fiddly to set up but once adjusted and locked up they won't shift. If they did the same mount in 30mm I wouldn't use another 1 piece mount.
To my mind all airgun mounts should either be adjustable or have a built in droop.