This kit is a combination of the Shield Duty/Carry Action Enhancement Kit and the Shield Action Enhancement Pad.For details of each kit, see our descriptions for both the Shield Duty/Carry Action Enhancement Kit and the Shield Action Enhancement Pad AET.The Shield Action Enhancement Kit directly replaces the factory hinged pad with a solid aluminum body. This reduces pre-travel and over-travel by approximately 20%.  It features a flat face with a center mounted pivoting safety.  The center mounted pivoting safety bar prevents unintended operation by creating a block that will not disengage unless the shooter places their finger directly on the trigger face.  The flat, smooth face trigger causes the shooter to place their finger on the center line of the pad and encourages manipulation directly in line with the bore axis.  The Shield Action Enhancement Kit is perfect for use with the M&P; Shield already equipped with the Apex Shield Carry Kit.