If the triggers don't smooth out to your liking after the aforementioned 500 rounds, I've used the Ghost standard 3 1/2 lb drop-in connector (the first one in the linked chart below) in a bunch of Glocks. They drop right in and work as advertised to lighten/smooth up the pull. That's the most I ever do to a Glock trigger. On my Gen 4 19, I didn't even need to do that. The trigger pull on it after a few hundred rounds is as good as my Gen 3 guns with the Ghost 3 1/2 lb connectors.
Ghost Connector comparison chart
