This unusual mount from Diana delivers up to 99% recoil reduction to your scope. The manufacturer says you can use budget scopes on high-power air rifles because the mount is rigid and has holding power. Whether you use a 1" or 30mm tube scope, the ZR mounts will work for both sizes! Plus, some air rifles have droop, making it difficult to mount and sight-in a scope without resorting to shims. This mount comes with 0.04" (1.016mm) droop compensation built in.