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This CZ70 is not my pistol. An old woman gave it to an acquaintance.
I have only once seen this particular pistol, so one would need to investigate it to determine the setup.
For safety measures, it seems that cooked and locked might be the solution.
The "safety" is a hammer drop device. If you apply the safety, the hammer drops.
The options are:
1. hammer down, safety engaged and
2. hammer down, safety disengaged.
Empty chamber is never really an option on a SD gun.