The Apex Action Enhancement kit for the CZ 75 B series pistols is designed to improve performance and 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 lb. 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 require eliminate the need for any polishing or stoning. Only use the factory firing pin. Features: Direct replacement for the factory hammer and sear Delivers a clean, consistent single-action style trigger break while providing a smooth stack-free double action Approximately 7 lb DA with 5 lb SA using carry mainspring Approximately 6 lb DA with 4.5 lb SA using competition mainspring Easy to install