Apex Tactical Specialties Action Enhancement Trigger / Duty/Carry Kit for Shield 45. The Trigger Kit directly replaces the factory hinged trigger with a solid aluminum trigger body which reduces pre-travel and over-travel by approximately 20percent. It features a smooth face with a center mounted pivoting safety that maintains factory safety values. The Apex Duty/Carry Kit for the S&W M&P Shield 45 was designed to provide the pistol owner a smooth consistent trigger pull that is approximately in the range of 5.0 to 5.5 lbs. with the advantages of shorter over-travel and more detectable trigger reset Specifications for Apex Tactical Specialties Action Enhancement Trigger Duty/Carry Kit for S&W M&P Shield 45: Manufacturer: Apex Tactical Specialties Color: Black Gun Model: Smith & Wesson M&P 45 Shield Package Contents: Apex Tactical Specialties Action Enhancement Trigger Duty/Carry Kit for S&W M&P Shield 45 What firearm models does the manufacturer say Apex Tactical Specialties Action Enhancement Trigger Duty/Carry Kit for S&W M&P Shield 45 is compatible with? The manufacturer says that Apex Tactical Specialties Action Enhancement Trigger Duty/Carry Kit for S&W M&P Shield 45 is compatible with Smith & Wesson M&P 45 ShieldApex Tactical Specialties 100-161: Action Enhancement Trigger / Duty/Carry Kit for Shield 45