An excellent base from which to build a beautiful, smooth and reliably functioning gun. Includes a redesigned trigger spring and a reduced power hammer spring to give controlled trigger pull. Also includes extra power, base pin latch spring. Factory hammer spring is 23 lb. Kit includes (3) different reduced power hammer springs; 17, 18 & 19 lb. (Factory is 23 lb.), (1) 25% reduced power trigger spring, plus one extra power base pin latch spring.