The Apex Polymer SD Action Enhancement Trigger Kit directly replaces the factory hinged trigger with a solid body polymer trigger and a center mounted pivoting safety. The model 107-103 Apex Tactical Enhancement trigger kit provides a smooth comfortable surface for the shooters finger while firing. This great SD action trigger kit provides reduced pre-travel by approximately 20% and over travel by 10% when compared to the factory trigger. The Apex Tactical Polymer SD Action Enhancement Trigger is perfect for use in SD and Sigma pistols already equipped with an Apex SD or Sigma Spring Kits.