The Apex Tactical Specialties 100073 is a Duty/Carry Action Enhancement Kit specifically designed for the M&P pistol (compatible with 9mm, .357Sig, and .40 S&W only). It offers a flawless and consistent 5.0 to 5.5 lbs. trigger pull. In addition to providing a comfortable pull weight, it also ensures shorter over-travel and a reduced trigger reset for optimal performance. All included components are designed to work synchronously, offering an acceptable weight range for a premium service pistol.This kit is designed with the user\'s convenience in mind; it\'s a drop-in kit that requires no additional gunsmithing. However, for best results, we recommend installation by an armorer or a gunsmith. The kit includes: (1) Fully Machined Seer, (1) Duty Carry Spring Set, (1) Ultimate Striker Block Kit, and (1) Slave Pin.