Apex Tactical 100073 Duty/Carry Action Enhancement Kit 357 Sig Fits S&W M&P Pistol MetalThe Apex Duty Carry Action Enhancement Kit is engineered to provide the S&W M&P (. 9mm, . 357 Sig & . 40 S&W) pistol owner a smooth, consistent 5. 0 to 5. 5 lbs. trigger pull with the advantages of shorter over travel and shortened trigger reset. All of the components work together to provide a pull weight within the acceptable range for a top end, service pistol. The kit is designed to be drop in and should not require further gunsmithing, however,