Normally they lose accuracy when dirty, I only clean my barrel when it needs it or I'm bored, have owned the CZ but didn't like it so sold it and bought an Anshultz, always dead accurate, sold that for @BRADS Sako just been out this avo and shot 3 rabbits all at about 120-150, one shot kills. Unless mechanical damage I'd say cleaning is the prob, I use a bore snake on mine,
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