Goto the CZ Forum and see how to detail strip the gun, focusing on how to remove the safety. http://www.czfirearms.us/index.php
Once you've got it out, smooth the underside and repaint it using slighlty thinned matte black auto body paint. You can touch up the frame the same way -- lightly sanding and then painting with the paint. I've done this sort of touch up on CZs and Sphinxs, and if you do it carefully, it's practically invisible.