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Brand New Glock 34 Gen 5 MOS failure to eject

7K views 37 replies 24 participants last post by  Bunnies4r5 
#1 ·
I’m new to Glocks but was sold on “Perfection”. Just bought a new glock 34 Gen 5 MOS. Immediately started jamming/failure to eject with the first shot. Using 115 grain range ammo. Failure to eject after every shot. Anyone else experience this before? It is very frustrating to say the least.
 
#7 ·
You say range ammo, what do you mean and what brand please?
Steel or brass case?

Per armorers manual
, failure to eject causes:

broken or damaged extractor-unlikely since pistol is new

underpowered ammo-FIX change ammo. try 124 or 147 grain

dirty chamber
-unlikely since pistol is new

limp wristing-possible/seems unlikely since occurs on every shot.
Don't rule out

lack of lubrication- FIX lube per specs

dirty gun
-unlikely since you say gun is new

Have you cleaned pistol at all?

Most new Glocks have a wet/oiled firing pin channel-wipe that crap out.
it is brass 115 grain, don’t remember the brand. I had my more experienced friend fire it too, definitely not limp wristing. I will check firing pin channel but fired out of box
 
#3 · (Edited)
You say range ammo, what do you mean and what brand please?
Steel or brass case?

Per armorers manual
, failure to eject causes:

broken or damaged extractor-unlikely since pistol is new

underpowered ammo-FIX change ammo. try 124 or 147 grain

dirty chamber
-unlikely since pistol is new

limp wristing-possible/seems unlikely since occurs on every shot.
Don't rule out

lack of lubrication- FIX lube per specs

dirty gun
-unlikely since you say gun is new

Have you cleaned pistol at all?

Most new Glocks have a wet/oiled firing pin channel-wipe that crap out.
 
#4 ·
Took my 13 YO son shooting this weekend and he had a similar problem when shooting my G34 Gen 5 MOS. We were shooting WWB 115 GR FMJ and he was limp wristing it for sure. Not sure if that’s your problem but it happened to him about 10 times.
 
#15 · (Edited)
This (ALWAYS clean and relube a new gun before the 1st range trip - this is the cause of so, so many 1st range trip woes). And, use good, factory ammo.

Also, try to get a good grip on the gun too

As has already been said, definitely try a more stout ammo. Also, the pistol needs to be cleaned of the factory protectant and properly lubed. Can’t expect a pistol to properly function if you haven’t cleaned and lubed it.
Sho nuff!!!!
 
#9 ·
Welcome to GT!

Didn't notice you just signed up.

Firing pin channel shouldn't be cause, but will contribute.

My post isn't a jab at you, it's from latest armorers manual.

Trying to troubleshoot from an arm chair.

I agree with JCN on stouter/heavier ammo. Sure as hell worth a try
 
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#10 · (Edited)
When the gun is brand new, the recoil spring is at its strongest/stoutest (Not to mention metal-to-metal contact of parts that needs smoothing out). It doesn't help reliability when the ammo you're using may be somewhat underpowered. Glocks are designed for 9mmNATO. The U.S. equivalent of 9mmNATO is 9mm+P. After the recoil spring has been broken in, the gun becomes less sensitive to various ammo.

You can manually rack the slide to break in the recoil spring/simulate firing.

Good luck.
 
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#12 ·
I tend to agree on the point of ammo selection in this case. My Glock 17L (long-side) is kinda sorta like a 34. It likes 124gr and does not like 115gr, and it hates the weak-ass house brand ammo that my local indoor range sells for cheap. I feed it decent quality 124gr ammo (Sig, Magtech, S&B, Blazer, etc.) and have had no issues. Same thing with my CMMG Guard 9mm PCC. Come to think of it, I don't even buy 115gr anymore, only 124gr and sometimes 147gr.
 
#14 ·
As has already been said, definitely try a more stout ammo. Also, the pistol needs to be cleaned of the factory protectant and properly lubed. Can’t expect a pistol to properly function if you haven’t cleaned and lubed it.


Sent from my iPhone using Tapatalk
 
#17 · (Edited)
Most factory 115 gr plinking ammo is pretty weak stuff. Now combine that with a new gun with stiff springs, possible limp wristing, the slight additional reciprocating weight of a red dot sight, and you will get function issues. Somebody correct me if I am wrong, but for some reason I am thinking that Glock also did away with the window cut out in the top of the slide on Gen5s... on previous gens this also helps to offset reciprocating weight added by the longer slide and barrel...

Like others have said, clean and thoroughly lube it, get some 124gr ammo or stouter 115, grip the gun tighter and see if that works. If not, if the gun is a range gun only, I would recommend dropping to a 15# recoil spring and 5# striker spring. That should cure it...
 
#18 ·
I have 2 G34.5’s. Neither was reliable with the factory RSA with 115 gr Federal or Winchester White Box with my daughter shooting them and her grip is good for a young lady. After adding a red dot sight, neither was reliable with me shooting my 147 reloads at 890 FPS. I fixed them with a 13 lb spring and guide rod.

They are just sprung a little strong. Stronger ammo or a weaker spring should fix it.

On the perfection comment, it’s impossible to have a gun sprung perfectly for weak practice loads and strong defense loads at the same time. Anyone who tells you differently is lying to you.
 
#19 ·
In a similar vein, shooting my reloads that worked fine in all my older 9mm’s, when I picked up a new Glock, were not enough to run reliably. I am very conservative with reloading ( if a load 1/10 of a grain above minimum runs, I don’t push it) but for that new Glock had to run a load at 1/10 of a grain below max. After the first 500 rounds or so, backed down to my original cream puff load and it worked perfectly again
 
#20 ·
9mm Glocks are sprung for hot ammo - 9mm NATO. If you have an optic mounted adding even more mass to the slide you should be surprised if you don't have problems with light loads. I know it's hard to find ammo during the ammopocalypse but it should run fine with self defense loads or Speer Lawman. If you still have problems with hotter loads try replacing the extractor, it's uncommon but it can be out of spec and cause failures to eject and feed. Gen5's use a different extractor from previous Gen's so if you end up replacing it make sure you get a Gen5 9mm extractor.

Also make sure it's lubricated.
 
#21 ·
Hmm, my Gen 4 34 with optic mount and Gen 5 17 have worked with all types of ammo.

Try a different ammo brand/grain. If still has the same problem, I would lean towards user error. I was initially having problems with the slide not locking back, but I was hitting the extended slide release. I changed out to the regular slide release and have had no issues since. I was pushing the slide release down, but you can also have issues with pushing it slightly up.
 
#23 ·
Most 115 gr stuff is plenty warm enough.
This rings true to me.

My pistol still wouldn’t work with 147’s and stuffed aftermarket mag extensions even with the 13lb spring. At that time, I was loading a factory 115 in the barrel to help the slide get back on a mag stuffed with 23 rounds of 147 gr reloads.

I’ve since switched to 125’s at about 132PF and those issues are gone.
 
#28 ·
I would watch and make sure it ejects with a slow manual rack of the slide (be safe doing this). But check that there's not a piece of metal under the extractor keeping it from grabbing or something. Also make sure your grip isn't stopping the backwards motion of the slide (unlikely since your friend also had an issue).
 
#30 ·
Try Federal or Blazer brass ammo and report back.

I converted my G34.4 to a 3rd gen guide rod and spring. Because that's what I was familiar with.

Make sure you hold the pistol firmly, up as high as possible. It'll loosen up eventually. If the gun is an issue, Glock will take care of it. Just make sure before you go through the hassle.
 
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