The Apex Action Enhancement Trigger directly replaces the factory hinged trigger with a solid body polymer trigger, and a center mounted pivoting safety. The rounded face of the trigger provides a smooth comfortable surface for the shooter's finger while firing. The trigger also reduces pre-travel and over-travel from the factory trigger.The Apex Duty/Carry Kit is engineered to provide the M&P M2.0 (and M&P 45) pistol owner with 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. Includes: 1 ea. Polymer Action Enhancement Trigger 1 ea. Heavy Duty 1/8" Sear Spring 1 ea. Slave pin (assists with installation of trigger return spring)1 ea. 2-Dot Fully Machined Sear 1 ea. Duty Carry Trigger Return Spring 1 ea. Ultimate Striker Block Kit (Striker Block, Spring and Talon Tactical Tool) Installation resources can be found online at http://www.apextactical.com