The Apex Action Enhancement Kit for the CZ Shadow 2 pistol is designed to reduce the large difference in trigger pull weight that exists between the double-action first shot and the subsequent single-action shots to approximately 2 pounds. The hammer and sear have matching Apex engineered single-action engagement surfaces that yield a clean, consistent single-action style trigger break while providing a smooth stack-free double-action. The matched sear and hammer engagement surfaces eliminate the need for any polishing or stoning.