What It Does This kit is a combination of the Apex Shield Duty/Carry Action Enhancement Kit and the Apex Shield Flat-Faced Action Enhancement Trigger. The Trigger Kit directly replaces the factory hinged trigger with a solid aluminum trigger body which reduces pre-travel and over-travel by approximately 20 percent. It features a smooth flat face with a center mounted pivoting safety that maintains factory safety values. The Apex Shield Duty/Carry Kit was designed to provide the M&P Shield pistol owner a smooth consistent trigger pull that is approximately 2 lbs lighter (based on variations in factory tolerances) with the advantages of shorter over-travel and more detectable trigger reset. The kit itself is engineered to be drop-in and should not require further gunsmithing. However armorer or gunsmith installation of the Ultimate Striker Block (USB) into the Shield slide is strongly recommended**. Expected Results ? Reduces trigger pull by approximately 2 lbs. ? Smooth uptake and reset ? Reduces pre-travel ? Reduces over-travel ? Reduced reset ? Center mounted pivoting safety maintains factory safety values Applicable To What Gun(s) Works with all Smith & Wesson M&P Shield Pistols in 9mm and .40 calibers. In The Package 1 ea. Aluminum Shield Flat-Faced Action Enhancement Trigger 1 ea. Trigger Return Spring Installation Shield Slave Pin (to assist with trigger return spring installation) 1 ea. Fully machined .45 Sear 1 ea. Ultimate Striker Block Kit 1 ea. Ultimate Striker Block 1 ea. Striker Block Spring 1 ea. Talon Tactical tool 1 ea. Shield Carry Spring Set 1 ea. Sear Spring (1/8")1 ea. 4 lb Rated Trigger Return Spring