Volquartsen's target hammer is designed to give the factory Ruger 10/22 a superb "trigger job" by simply replacing the factory hammer. No stoning or fitting is required. Reduces trigger pull down to approximately 2.5 – 2.75lbs. EDM cut from A-2 Tool Steel and hardened to Rc 58–60. Includes our 10/22 hammer spring hammer bushings hammer shims and trigger return spring.