Ghost rocket trigger connector.
Just finished installing the entire ghost rocket setup on my G23. That includes the 6 pound trigger spring, the 6 pound firing spring the safety spring and the trigger connector. The end result in dry fire is perfection very smooth, no over travel after firing and almost immediate reset. The product is well worth the money. All the springs in the kit are drop in, the trigger connector not so much. In all I filed on it for a little more then an hour to get it perfect for me. The biggest downside to it was that the process was very slow. File the connector put the gun together not there yet so disassemble file again, and this repeats it's self over and over again. In the end it is well worth it and if your willing to put in the time to get it right I say go for it.
Good luck and Good Shooting