This Picatinny Rail from Britannia Rails is manufactured to fit the CZ 452 3/8th action, the extended rail reaches forward.
Britannia Rails are made from high quality T6 aluminium.
Please check your CZ452 dovetail width to the chart below, if the top width of your dovetail measures 13mm (3/8th action) you need the CZ 452 picatinny rail, you are in the right place.