The Patriot Defense Optimized Sear Spring – Reduced Power was engineered from the ground up to work in your current EAA Witness Tanfoglio, IFG Defiant Tanfoglio, IWI Jericho, and CZ-USA 75 series pistol. These are precision made from premium grade rocket wire offering extended life and quality control from the factory springs that are supplied with the guns. This reduced power spring offers you a lighter trigger while still maintaining correct functionality of the trigger system.