I recently bought a Glock 17. The previous owner had install a bunch of Zev internal parts. It was not a complete Zev trigger but the spring kit. I went to the range today and to my dismay when I pull the trigger it double taps everytime. I am not pulling the trigger twice. I can pull.the trigger and remove my finger and it double taps. Any ideas. I guess I will need to find a good Glock smith. It is kind of cool bUT it is not really safe. Thanks.