The Apex Performance Connector for GlockA(R) model pistols is designed for use in all GlockA(R) 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 GlockA(R) model pistols, including the Gen 5 models. Does NOT fit and is not for use in the GlockA(R) 42 and GlockA(R) 43. Mfg: Apex Tactical Specialties Inc