Tyrant CNC Improved Tyrant Trigger System, Fits Glock Gen 3/4, Anodized Finish, Gray Body with Black Safety Blade TD-GTRIG-3-4-GREY-BLACK-BAR For a Glock Gen 3 trigger compatible with Glock systems and designed to optimize performance, consider Tyrant CNC's I.T.T.S Trigger, a popular upgrade for your Gen 3 or Gen 4 Glock handgun. The I.T.T.S. trigger features a 15% reduction in take-up and a 10% decrease in reset travel distance.