gen 5 g19 not locking open

Shadow9mm · June 19, 2020, 06:35 PM

So I'm in the initial stages of trying to diagnose the issue, I suspect it under powered ammo. Its a new G19 Gen 5. It has maybe 250-350rnds through it. The last 2 times I was out I had multiple issue with the slide failing to lock back on empty. I tried 2 different mags same issue, both were brand new mags and the springs feel plenty stiff. The gun would lock open without issue if i racked the slide on an empty mag. I prefer to shoot 115g federal. I don't remember having any issued with federal 115 or 147g the first time or 2 I took it out. The last 2 times I shot freedom munition reman 115g, failure to lock open was the rule, not the exception. I made sure i had a good grip and did not limp wrist. I also made sure i had a good grip and had fingers away from the slide stop lever.

I know I read about the 4th gen being designed for hot 124g and having issues with standard 115g due to the recoil spring but I understood this was adressed. is this an issue with the gen 5 guns?

were there any differences going to gen 5 mags other than the orange follower and lipped base plate? any reports of issues with the new mags?

Next range outing I plan to shoot several different brands and chrono them all to see if i can pin it on a ammo issue, or if it is a gun issue. I also plan to test 6 different mags.

AK103K · June 19, 2020, 07:34 PM

Glocks are known for liking warmer ammo.

The first Glock I got back in the 80's caused me to up the loads I was using for my other 9mm's at the time (High Power, P38, HK P7). Once I did that, they have been fine, and the other guns are fine as well.

I use 124 grain bullets loaded towards the upper end of the load data.

I have a couple of different Gen 5's, as well as Gen 2-4's, and they all work fine with the same ammo.

jman841 · June 20, 2020, 06:09 AM

I would reach out to Glock. I have a Gen 4 Glock 19 and have shot a ton of freedom munitions reman ammo without any issues. Although, I have gone through 3 different recoil springs and 2 different extractors since purchasing it in early 2012. Mine was one of the original versions that was plagued with issues.

Shadow9mm · June 22, 2020, 06:41 PM

Quote:

Originally Posted by jman841

I would reach out to Glock. I have a Gen 4 Glock 19 and have shot a ton of freedom munitions reman ammo without any issues. Although, I have gone through 3 different recoil springs and 2 different extractors since purchasing it in early 2012. Mine was one of the original versions that was plagued with issues.

I don't want to take up their time with something i might be able to sort out in a range session.

Woolecox · June 22, 2020, 09:00 PM

Are you riding the slide release with you thumb?

Shadow9mm · June 22, 2020, 10:26 PM

Quote:

Originally Posted by Woolecox

Are you riding the slide release with you thumb?

nope, made sure of that once i started having issues

Shadow9mm · June 26, 2020, 07:03 PM

Update, went to the range. Tested 5 different glock magazines, tested 2 different ammunition brands both of which work fine in 2 other guns. Out of 40 tests, it only locked open 3 times. No limp wristing, no finger on the slide stop. Contacted Glock, hopefully they can help me out.

Shadow9mm · July 2, 2020, 05:31 PM

Last update. I am feeling like an idiot. I did have my thumb on the slide stop. I never had an issue before but I have been modifying my grip. I though I made sure I had my thumb off when testing the last 3 times, but apparently I did not. I shot today and checked my grip and made sure i was off of it and it locked open every time. All i can chalk it up to is my grip being wrong the last 3 times or so I went shooting. I could have sworn i was no where near it and I remember checking too. Moral of the story is make sure you check every thing and isolate each test.

greentick · July 2, 2020, 06:02 PM

Man... sucks for you, *I* have never felt like an idiot (LOL)

Glad you got it figured out

TunnelRat · July 2, 2020, 06:05 PM

Yeah in the future a good way to test this is to shoot it one handed. If it doesn't do it one handed, chances are it's you. That said, kudos for owning the mistake.

Shadow9mm · July 2, 2020, 09:53 PM

Quote:

Originally Posted by TunnelRat

Yeah in the future a good way to test this is to shoot it one handed. If it doesn't do it one handed, chances are it's you. That said, kudos for owning the mistake.

gotta own em and learn from them. hopefully somone else can learn from my mistakes

jman841 · July 3, 2020, 07:14 AM

Same thing happened to me yesterday with a Sig P365. Rented one to test it out. Slide was not locking open and I thought it was an issue with the mags or something. Then looked at my grip and my thumb was resting right on the slide release.

If I end up buying one, I will def have to adjust my grip when shooting it.

Snuffy308 · July 3, 2020, 09:14 AM

Quote:

Originally Posted by TunnelRat

Yeah in the future a good way to test this is to shoot it one handed. If it doesn't do it one handed, chances are it's you. That said, kudos for owning the mistake.

Yep. This.

June 19, 2020, 06:35 PM	#1
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 3,976	gen 5 g19 not locking open So I'm in the initial stages of trying to diagnose the issue, I suspect it under powered ammo. Its a new G19 Gen 5. It has maybe 250-350rnds through it. The last 2 times I was out I had multiple issue with the slide failing to lock back on empty. I tried 2 different mags same issue, both were brand new mags and the springs feel plenty stiff. The gun would lock open without issue if i racked the slide on an empty mag. I prefer to shoot 115g federal. I don't remember having any issued with federal 115 or 147g the first time or 2 I took it out. The last 2 times I shot freedom munition reman 115g, failure to lock open was the rule, not the exception. I made sure i had a good grip and did not limp wrist. I also made sure i had a good grip and had fingers away from the slide stop lever. I know I read about the 4th gen being designed for hot 124g and having issues with standard 115g due to the recoil spring but I understood this was adressed. is this an issue with the gen 5 guns? were there any differences going to gen 5 mags other than the orange follower and lipped base plate? any reports of issues with the new mags? Next range outing I plan to shoot several different brands and chrono them all to see if i can pin it on a ammo issue, or if it is a gun issue. I also plan to test 6 different mags. __________________ I don't believe in "range fodder" that is why I reload.

June 26, 2020, 07:03 PM	#7
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 3,976	Update, went to the range. Tested 5 different glock magazines, tested 2 different ammunition brands both of which work fine in 2 other guns. Out of 40 tests, it only locked open 3 times. No limp wristing, no finger on the slide stop. Contacted Glock, hopefully they can help me out. __________________ I don't believe in "range fodder" that is why I reload. Last edited by Shadow9mm; June 26, 2020 at 08:03 PM.

July 2, 2020, 05:31 PM	#8
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 3,976	Last update. I am feeling like an idiot. I did have my thumb on the slide stop. I never had an issue before but I have been modifying my grip. I though I made sure I had my thumb off when testing the last 3 times, but apparently I did not. I shot today and checked my grip and made sure i was off of it and it locked open every time. All i can chalk it up to is my grip being wrong the last 3 times or so I went shooting. I could have sworn i was no where near it and I remember checking too. Moral of the story is make sure you check every thing and isolate each test. __________________ I don't believe in "range fodder" that is why I reload.

July 2, 2020, 06:02 PM	#9
greentick Senior Member Join Date: January 15, 2011 Location: Deep South Posts: 261	Man... sucks for you, I have never felt like an idiot (LOL) Glad you got it figured out __________________ nous défions

July 2, 2020, 06:05 PM	#10
TunnelRat Senior Member Join Date: May 22, 2011 Posts: 12,212	Yeah in the future a good way to test this is to shoot it one handed. If it doesn't do it one handed, chances are it's you. That said, kudos for owning the mistake. __________________ Know the status of your weapon Keep your muzzle oriented so that no one will be hurt if the firearm discharges Keep your finger off the trigger until you have an adequate sight picture Maintain situational awareness

June 19, 2020, 07:34 PM	#2
AK103K Senior Member Join Date: May 1, 2001 Posts: 10,223	Glocks are known for liking warmer ammo. The first Glock I got back in the 80's caused me to up the loads I was using for my other 9mm's at the time (High Power, P38, HK P7). Once I did that, they have been fine, and the other guns are fine as well. I use 124 grain bullets loaded towards the upper end of the load data. I have a couple of different Gen 5's, as well as Gen 2-4's, and they all work fine with the same ammo.

June 20, 2020, 06:09 AM	#3
jman841 Senior Member Join Date: March 18, 2009 Posts: 715	I would reach out to Glock. I have a Gen 4 Glock 19 and have shot a ton of freedom munitions reman ammo without any issues. Although, I have gone through 3 different recoil springs and 2 different extractors since purchasing it in early 2012. Mine was one of the original versions that was plagued with issues.

June 22, 2020, 09:00 PM	#5
Woolecox Senior Member Join Date: October 11, 2007 Location: Texas Posts: 152	Are you riding the slide release with you thumb?

July 3, 2020, 07:14 AM	#12
jman841 Senior Member Join Date: March 18, 2009 Posts: 715	Same thing happened to me yesterday with a Sig P365. Rented one to test it out. Slide was not locking open and I thought it was an issue with the mags or something. Then looked at my grip and my thumb was resting right on the slide release. If I end up buying one, I will def have to adjust my grip when shooting it.