The stock trigger in a bolt action BRNO or CZ can be rather heavy, but can be markedly improved fairly easily by judicious polishing of the sear faces via a small sharpening stone, once removed from the rifle; if you’re not confident you can do this a decent gunsmith should be able to undertake the work.
The polished sears transform the performance and shooting experience, but take care not to overdo the polishing, or the trigger could become dangerously light.
I believe there are or were also aftermarket trigger tuning kits available for CZ rimfire rifles, containing a lighter gauge spring and pre polished sears.