Apex Tactical Specialties Advanced Flat Trigger, Fits Sig P320, Includes Forward Set Trigger Bar 112-031 The Apex Flat Forward Set Trigger Kit for the factory upgraded models of the Sig Sauer P320 is a direct replacement to the factory trigger bar and curved trigger and is easily installed. The patent pending Apex Forward Set Trigger Bar reduces trigger travel and reset while the Apex Flat Advanced Trigger reduces the trigger pull weight.