Re: striker springs. My G19 (reasonably modified gen4). Would not reset the trigger properly using anything less than a 5# striker spring.
Changing striker springs? Protip: Save yourself the time- just take a kettlebell weight thing, strap it to a beam with a rope, like a pendulum, and then just give it a good swing, and let it smash you directly in the nuts. That's what you're doing when you mess with the striker spring on a Glock. It literally regulates several different things in the gun. When you change it, you're f***ing up several variables simultaneously.
Nearly EVERY glock I've ever seen f*** up, SOMEONE has f***ed with that spring. It's basically a guarantee.