Just an FYI for all of you with Gen 2 Glock 19's if you decide to upgrade it. My Glock 19 still had the original parts from almost 20 years ago (it never got the 6 part upgrade). Recently I decided to update/refresh it.
The new parts I installed are:
- trigger/trigger bar,
- firing pin safety & f.p. safety spring,
- extractor dep. plunger, plunger spring & spring loaded bearing
- trigger housing with 336 ejector
- recoil spring assy
- trigger spring
- slide lock spring
- new, metal lined magazines (not ambidextrous)
After replacing all these, the gun still operated reliably, but the ejection pattern was more erratic than before - brass would sometimes be ejected straight backwards hitting me in the forehead (I never had this problem before).
I did some tests and my older, non metal lined magazines seemed to partially solve some of the brass-to-face problems.
Maybe the weaker springs affects the ejection timing - I'm not sure why. What fixed it totally was replacing the 336 ejector with a Gen 4 #30274 ejector. I had to buy a Gen 4 trigger housing and push out the ejector, since the Gen 4 housing will not fit a Gen 2.
'Hope that helps!