The half cock function allows the loading gate to open and makes sure the chambers will line up with the loading gate. Provides 3 positive clicks when hammer is cocked. Allows for a 2-1/2 -3 pound trigger pull and includes Wolff hammer springs, one of each of 17, 18, 19 lb, a reduced powder trigger spring, one extra power cylinder latch pin spring. Minor fitting is required for proper installation. Instruction included.