Wasn’t sure where to put this so thought I’d start here.
I reload most all of my own ammo including 9mm. I mostly use 147 round nose plated bullets with 3 grains of tite-group and it has worked reliably in my Glock 19 & 26, Beretta92, SiG 226, CZ Shadow2 & Scorpion EVO and every other 9mm I have except the Glock34. This load won’t eject at all. I bumped the powder charge up to 3.6 which is max load for the 147 according to Hodgeson load data. With this stronger load when it ejects it bounces off my head or drops at my feet but about 1/3 of the time the slide closes on the case, in an AR it’s a short stroke.

For concealed carry, I use Speer 147 bonded Gold Dot and it runs perfectly, events about 5’ to my right but I didn’t get the 34 to carry.

Has the 34 got to heavy of a recoil spring? Are there lighter springs available?
I don’t want to have to a specific load just for this one pistol.

This is pure blue sky and see if it sticks territory. Since you haven't had any responses, check these long shots. Your problem sounds really weird.

1) Prior to 10/10/2011 there were BTF (brass to face) problems with some Glocks. Glock said the issues was resolved with their new Ejector and RSA. Check the following markings on parts.
Old (prior to 10/10/2022) Ejector 336, RSA 042.
New (guns shipped after that date) Ejector 30274, RSA 043.

2) A post from Para in 2017 on how to check RSA:
"Here's Glock's test for the RSA being replaced. A Glock factory tech showed me what they do.

Hold your pistol vertical with the muzzle pointed towards the ceiling. Pull pack on the slide about a half inch or so and while holding the slide back, depress the trigger. Then, while still depressing the trigger, let go of the slide. If the pistol fails to return to battery, replace the RSA."

This actually works. I had failure to properly eject issues on my G34. Did the test and it failed. Put in new RSA and it ran fine.

This may or may not apply to you. 115 grain CCI Blazer cases were either just dribbling out of the ejection port of my Gen 3 G34 or bouncing off my glasses. Unfortunately I made two changes at once - I put in a 15 lb Wolff recoil spring and replaced the 336 ejector with a 47021 from a Gen 5 trigger housing. Not sure which one fixed the problem, but it now ejects properly.

quote:

Originally posted by Nipper:
<snip>
Hold your pistol vertical with the muzzle pointed towards the ceiling. Pull pack on the slide about a half inch or so and while holding the slide back, depress the trigger. Then, while still depressing the trigger, let go of the slide. If the pistol fails to return to battery, replace the RSA."

This actually works. I had failure to properly eject issues on my G34. Did the test and it failed. Put in new RSA and it ran fine.

Sorry for the lack of acknowledgment Nipper, I got home today after a 10 days hiatus/holiday, but I’ll be trying your suggestion tomorrow when I get to the range and test the RSA … I’m also working up the powder charge as it’s obviously too weak, as mentioned previously, my factory carry load is also 147, however a round nose instead of a hollow point.

quote:

Originally posted by Mauser96:
This may or may not apply to you. 115 grain CCI Blazer cases were either just dribbling out of the ejection port of my Gen 3 G34 or bouncing off my glasses. Unfortunately I made two changes at once - I put in a 15 lb Wolff recoil spring and replaced the 336 ejector with a 47021 from a Gen 5 trigger housing. Not sure which one fixed the problem, but it now ejects properly.

Mauser96-
Mine is a Gen4 and has the dual spring set up and I’ve been thinking of using a G17 spring or seeing whats available but I’ve never needed to do this before so trying to figure out where to start because of course, I don’t want to damage the pistol … however I would like to suppress it, and my carry load is quieter with my suppressor, it’s really not very quiet!