The Apex Performance Connector for Glock® model pistols is designed for use in all Glock® pistols (excluding the model 42 and 43) and will reduce the trigger pull weight by approximately 1 pound when compared to the original factory component. Expected Results: Reduces trigger pull weight by approximately 1 lb. Direct replacement of standard factory connector Works with almost all Glock® model pistols, including the Gen 5 models. Does NOT fit and is not for use in the Glock® 42 and Glock® 43.