I have a 17 & a 22. I have installed the "Ghost 3.5lb " trigger kit in both. The kit comes with the connector & three springs and is drop in installation. There is a video on Utube to help. They also make a trigger connector that has to be fitted if you want to work with it.
The improvement was a smooth lighter pull and shorter reset. If you don't like it, it's very easy to change back.
When ever I work on a semi auto trigger, I load only two rounds in the magazine for test firing.
I read somewhere that Glock was/is offering a 3.5 lb connector.