The APEX Duty/Carry Action Enhancement Kit (DCAEK) was designed to provide the M&P 45 pistol owner a smooth, consistent 5 - 5.5 lb trigger pull with the advantages of shorter over-travel and reduced reset.
Includes:
Two sear springs of different sizes are included with kit. Use the one that fits your M&P.
IMPORTANT NOTE: "All Service and Warranty Issues Must Be Directed To Manufacturer."