This video shows how to strip an Air Arms S200 (CZ 200) and how to adjust the power after fitting a regulator. Do not exceed the legal limit for your country/state!

There is another video that shows how to actually fit the regulator to the cylinder.

Please seek the advice/assistance of an expert if you are in any doubt about fitting an aftermarket regulator to your rifle.
I accept no responsibility for any damage you may cause to your rifle or yourself.