The Apex Duty/Carry Action Enhancement Kit is engineered to provide the S&W M&P (.9mm, .357 Sig & .40 S&W) pistol owner a smooth, consistent 5.0 to 5.5 lbs. trigger pull with the advantages of shorter over-travel and shortened trigger reset. All of the components work together to provide a pull weight within the acceptable range for a top-end, service pistol. The kit is designed to be drop-in and should not require further gunsmithing, however, armorer or gunsmith installation is recommended. Kit includes Fully Machined Seer, Duty Carry Spring Set, Ultimate Striker Block Kit and Slave Pin.