I run them in all my CZs (even with the slim safeties). I was in some USPSA matches 10-11 years ago with the Shadow and would bump the safety occasionally upwards during reloads. At first I would mod Rami safeties for the left hand side until a few years later I discovered I could purchase the slim sets. Then Perman had the heavier rate springs and I found I could run the standard safeties with them and not have an issue. Now I just run them in everything for good measure. Never had a problem.