Another key difference between the models 17 and 19 is the geometry of the barrel lug and matching locking piece inside the frame.
I'm not trying to be a smart ass, but seriously, Glock has been releasing complete crap for the last five years? A voluntary upgrade is being offered to maintain the Glock tradition of ensuring that all of our pistoils are up to the latest standards in 21st century Goock technology.
Ejection pattern was about the same as original extractor and the gen 4 ejector which was 4-5 O'Clock and several feet behind me.
This makes them light weight and easy to carry around.