The H&K LEM trigger kit is a factory-designed upgrade for all USP, USP Compact, H&K 45 and H&K 45 Compact pistols, providing a smooth and consistent trigger pull. This universal kit includes all necessary components for a seamless conversion, ensuring reliable performance with H&K's renowned engineering and precision. The law enforcement modification (LEM) system enhances trigger control by reducing reset time and delivering a light, crisp break, making it an excellent choice for both duty and defensive use. Designed for durability and consistent operation, this kit allows shooters to experience an improved trigger feel while maintaining the trusted reliability of their H&K firearm. Comes with (2) hammer springs the longer hammer spring is for all USP, USP Compact and full-size H&K 45, while the shorter one is only for the H&K 45 Compact Use the trigger return spring already in your gun for a lighter LEM trigger pull, approximately 4-5 lb Use the trigger return spring in the kit for a heavier LEM trigger pull, approximately 7 lb