I replaced the firing pin spring with the 4lb spring in the kit and the plunger spring, the instructions state the trigger spring is not used in a Gen 5. Watching the cutaway videos, I am not sure if the firing pin spring affects the trigger feel. If the answer is no, should I use the stock spring or the 6lb spring?
The striker spring (it's a striker in these guns, rather than a firing pin) definitely affects trigger pull weight. That's the main force you're pulling against when you pull the trigger.
Be careful with a 4 lb spring in that 19, and shoot a ton of live ammo through it before you trust it. Every one I've tried ends up with light strikes sooner or later unless you go with one of the aftermarket strikers that are made for light springs, but I don't trust those for reliability either.
