Shooting the G19 Gen 3 for the first time, ejection was robust to the right with no brass in the face, the ejector hits were 7:30, 3/4s of the casings had zero case neck swipes, 1/4 had very slight case neck swipe marks, and no casings were dented. The length of the ejector went from 15.1 mm to 14.8 mm, which is all I wanted to do at first (when filing, you can't add metal). Looking from above, I made it squarely transverse across the frame. Covering the field stripped frame to avoid slip marks or getting shavings in the frame, I carefully filed a small amount off the ejector tip, with a 15 degree angle, with the top of the tip further back than the bottom of the tip.
The replacement ejector is shorter and has a reverse tip angle (top further back). The 336 ejector is long, pointy, and has the top of the tip sightly more forward that the bottom of the tip.
To solve this on a 1911 you need to tune (reshape) the ejector tip and/or lower the port. This is important for function and reloading. If the ejector hits the rim too high or too lateral, it kicks the casing out of the ejection port too low, the case neck hitting the inner lower edge of the port, and bouncing the casing up instead of cleanly out. When a pistol tosses brass at my face or ejects weakly, the first thing I look at is the ejector. From my tuning 1911's these are the signs of ejector tuning problems. One shell had a telltale mild swipe mark and faint dent at the neck. The ejector hits were high on the rim at 8 o'clock very close to the primer. Before I even shot my G19 I took a close look at the two aluminum casings that shipped with my pistol. I always examine the spent brass on new pistols for primer hit/smear, ejector hit, extractor claw markings, and case neck scrapes/dents. Extractor tension was perfect (stripped slide firmly holds a full round). There is supposedly a voluntary Glock recall with 336 stamped 9mm ejectors being replaced with an updated ejector. Gen 4 users are changing their extractors and recoil spring assemblies with varied success and lots of frustration.
None of them examine their spent brass which is what I think reveals the problem. YouTube shows Gen 4 users complaining about brass to the face, weak ejection, and stove piping. I was wary of the Glock Gen 4's due to complaints about erratic ejection, so I purchased a recently manufactured Glock 19 Gen 3.
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