The Apex Duty/Carry Action Enhancement Kit is engineered to provide the M&P (9mm, .357Sig & .40S&W only) 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 itself is designed to be drop-in and should not require further gunsmithing, however, armorer or gunsmith installation is recommended. Kit includes: (1) Fully Machined Seer, (1) Duty Carry Spring Set, (1) Ultimate Striker Block Kit, (1) Slave Pin.