Here is a picture of my Chapuis with a MAK mount:

As you can see, it will not be possible to operate the rifle if it was mounted any lower, unless you use a scope with even less eyepiece diameter than the Leupold 1.5-5x24 mounted here or a very tiny tumb:-)

Here is a picture of a Recknagel (ERA) mount for a 30mm tube:

I used that one for a Swarovski Z6 1-6x24 scope - but felt it upset the balance of the rifle, so I now use the lighter and more compact Leupold 1.5-5x24. As seen in this picture the Recknagel mounts have a slightly higher build height as well.