The competition kit for the Glock models G-20,21,29, & 30. Includes: Extended Slide Stop Lever, Extended Slide Lock, Extended Mag Catch, 4lb striker spring, and a 3.5lb Connector. All the parts drop in for a quick upgrade. The combination of the 4lb striker spring and the 3.5lb connector will give you a trigger pull that will improve your shooting accuracy with the Glock. NOT FOR DUTY OR CARRY.