Apex Tactical Series M&P Duty/Carry Spring KitThe Apex M&P Duty Carry Spring Kit gives shooters the ability to fine tune their trigger pull by utilizing any combination of springs. Paired with the Apex Fully Machined Sear, the kit will increase the trigger weight by approximately 1. 5 lbs. from approximately 4. 0 lbs. When used alone, the kit will increase trigger pull weight. Perfect for use with Apex Fully Machined Sear and Ultimate Striker Block to achieve a safe duty carry trigger pull weight