I was at the range today shooting in a competition after I placed a 4 pound striker spring into my Glock 17. I was using "brown bear" ammunition.
The course of fire ran 50 rounds. I documented at least 10 failures to fire.
I am not sure if I should blame the cheap Eastern European ammunition or the new 4 pound striker. In reality, it's probably a combination of both. I need to try to run some good, domestic ammunition and see if it makes a difference.