Apex Tactical Specialties Shield Action Enhancement Trigger And Duty Carry Kit For M&P Shield (9/40 only), Kit Includes - Action Enhancement Trigger, Slave Pin, Fully Machined .45 Sear, Ultimate Striker Block, Striker Block Spring, Talon Tactical Tool, Shield Carry Spring Set, Sear Spring (1/8"), Trigger Return Spring, Black Finish 100-051