Hiya diggers .
I never knew CZ made shotguns . Whats it like . is it a side by side or over and under .
Dont shotguns come new not oiled ? if so id say its just stiff . it wouldn,t be broke open much in the factory so what id do is give it a good shot of WD40 on the break open lever .
All the best .
if its not that then id say you will get some much better advice than mine over the day
Bob
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