I have a late 2010 manufacture Glock G19 Gen 4 that now has around 2,000 rounds through it. It came equipped with the 0-4 recoil spring assembly, "dip" extractor, and the 336 ejector. I bought it for daily carry in a plainclothes assignment and it has served me extremely
well. I have carried G19s for over 20 years and I trust in the system completely. For a couple of years I did not pay much attention to the reported Gen 4 problems such as failures to extract and brass to face; this was because my Gen 4 was completely reliable. (It still is completely reliable as I have never experienced any failures to extract or type 2 malfunctions).
It wasn't until February, 2013 that I watched Twang and Bang's great video documenting his issues with a Gen 4. I went to the range with 100 rounds of Winchester 124gr FMJ and soley watched the ejection patterns.
I was astonished to see that my reliable Gen 4 was ejecting spent casings in the "sprinkler" pattern. Five of the spent casings either hit me in the head or dribbled onto my forearm. Even more interesting was that HST and Ranger loadings in 124gr and 147gr ejected just fine as did Winchester 147gr FMJ.
I pulled the extractor and used an Arkansas stone to polish the top and bottom and then followed up with a Dremel polish. This only resulted in a slight perfomance increase when using the 124gr FMJ. I experimented around with LCI and non-LCI spring loaded bearings and did notice better ejection patterns with the non-LCI bearing.
Eventually I received a late-production "dip" extractor from the PNW Glock LE rep, the 30274 ejector and the 0-4-3 recoil spring assembly. I noticed that the new extractor moved a bit roughly in the slide channel so I did a polish with the stone and Dremel until it moved smoothly.
range experiment- I installed the standard LCI spring loaded bearing and the ejection pattern with Ranger 147gr RA9T was perfect. I had high hopes for the 124gr FMJ but they were dashed with two out of 100 hitting me in the head.
range experiment- I installed the non-loaded-chamber-indicator spring loaded bearing and repeated the experiment. The Ranger was now ejecting very forcefully and consistently five-to-six feet to the 5 o'clock position. All of the 124gr FMJ rounds were ejecting consistently to the same location but only going about half as far. I kept the non-LCI bearing in the G19.
Competition shooting this past weekend
- This was a medium distance shooting and moving course and you can see that the 124gr Winchester FMJ was ejecting adequately:
Here is a stationary "Bill Drill" with the same ammo:
You will notice that the first two rounds after the reload exhibited poor ejection but all the rest were good to go. Here is a slow-motion clip of the same:
Here is the second phase of the Bill Drill with one-hand shooting after the reload; performance was better, even more so with the one-handed shooting:
I took some pics of the extractor, plunger, etc. when I stripped it down before cleaning. Notice the bits of brass inside the slide near the ejection port:
The pistol has Heinie Straight Eight ledge sights with personally applied orange paint to the front sight.
The bottom line for me is that I still trust this gun and carry it daily on the job (and a December 2012 built Gen 4 G27 off the job). I hope this has been helpful to you.