I'm sure this is all old news to you CZers. Just thought I would pass this along to the new to CZ folks. We took 4 Czs here, three full size and one Compact and did noting other than change the Hammer Spring to a 13 pound spring we had on hand for Beretta 92s. AMAZING!!!!! AMAZING!!!!! 100% ignition with everything we ran through it. It is So good that it had some of us wishing for this in a DA only version with this spring installed. Better than any stock K Frame S&W ever. Try it.