The rail is slide over the existing mounts and held in place by screwing down the allen screws to clamp it in position. The silver allen screw goes into the locating cut out on the rear mount of the CZ.
Bushnell Elite 6500 2.5-16x42 Multi X Reticle , unmarked 30mm tube, crystal clear glass, side parallax down to 10 yards so good with NV add-on.
Boxed and complete with sun shade and end caps. £325 posted RMSD or collect Shooting Show on Friday