Gen 5 Glock 9mm Lock Up After Dud

Hartkopf

Hartkopf

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I've had two different gen5 Glock 9mm pistols that lock up after a dud round. The trigger is back and an unfired round is still in the chamber. Simple fix, rack the slide to eject the round. Not unless you're the incredible hulk. The slide is just about impossible to move. I'm a fairly strong guy and it takes everything I have plus perfect technique to get the slide unlocked and eject the round.

I discovered this issue after making dud rounds (no powder or primer) for practice clearing malfunctions at the range. I load random magazines with dud rounds the night before and mix them up so I have no idea when the dud will come up. I make the duds at the same station as my reloads which have been 100% reliable over thousands of rounds over the last 4 years. All rounds gauge and plunk in my guns.

Gen 4 Glocks do not have this issue. Rounds eject easily, no matter the position of the trigger.

Anybody know why gen5s have this issue or how to fix it?
 
Chamber on Gen5 guns is just a bit shorter than Gen4. Bullet is probably stuck into the lands. You may need to seat your bullets a bit deeper. For plunk test and seating depth, I took an existing round, colored it with a Sharpie, then dropped in removed barrel and rotated it in chamber with a bit of pressure from the primer end. If the lands scratched the sharpie marks, I seated a bit deeper and then repeated until no more marks on the sharpie marked area.
 
falmike said:
Chamber on Gen5 guns is just a bit shorter than Gen4. Bullet is probably stuck into the lands. You may need to seat your bullets a bit deeper. For plunk test and seating depth, I took an existing round, colored it with a Sharpie, then dropped in removed barrel and rotated it in chamber with a bit of pressure from the primer end. If the lands scratched the sharpie marks, I seated a bit deeper and then repeated until no more marks on the sharpie marked area.
Click to expand...
I appreciate your reply but thats not the issue. Rounds plunk and rotate freely. I even made some duds super short and used a Lee FCD to bring the diameter down more than normal. No difference, gen5s still lock up.
 
I have this happen occasionally with all of the different Gen Glocks I have, dud or not. The problem is usually an out of spec, slightly bulged round at the bullet base.

And while the case may be correct OAL when checked, its possible the bullet jumps forward a bit on chambering and might give you problems.

The fix is pretty simple and usually only takes a whack or two.

This clip explains his specific reason why he had problems, but the technique works for all of them. He shows it with an empty gun at around 2:45, and with a live gun at around 4:00.

www.youtube.com

Pistol Malfunction / Jam Clearing Fat Bullets with a Hot Gun

LIKE / SHARE / FAVE!Support our channel at http://www.Taylor-Tactical-Supply.comAmazon Store - http://astore.amazon.com/nisrrrere-20Ebay Store - http://store...
www.youtube.com www.youtube.com

If you have a gun like a 1911, BHP, etc, that doesn't have a FLGR, its a lot easier to do, and its done differently, and usually with the edge of a bench, door jamb, ect. With the FLGR's, the method he shows works, and will get the gun back into action fairly quickly. Would be a sucky malfunction to have in a gunfight, but at least you know what to do. :)
 
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Definitely not the ammo or my dud rounds. They all plunk, rotate and drop free in every barrel. The gen5 will lock up with a dud round. I can finally get that dud ejected, put it right in a gen4, pull the trigger and eject it like butter. I’ve even tried a cheap aftermarket barrel in the gen5, still locks up. I’ve tried an aftermarket conversation barrel in a gen4 g22, ejects easily. Every time the problem follows the gen5 and never the gen4. 5 total pistols tested, 2 gen5s and 3 gen4s.
 
If it passed the plunk test, and didnt fire, that shouldnt keep it from being ejected, unless the force of the firing pin is jamming the whole round tighter into the chamber somehow. Not sure thats doing anything though.

Easy way to check it is, size a couple of fired rounds without decapping them, and then load it without powder, and let the slide go forward from slide lock, and see how things go. Will it come out if you dont pull the trigger? Will it stick if you do?

I would think if the chamber was the problem, then you wouldnt be able to load a round, and then eject it without firing. Unless maybe the chamber is out of spec and maybe too long, or a tad short, but again, you still wouldn't likely be able to eject a loaded round that wasnt fired. Back to the firing pin driving it too deep? Then again, I would think the extractor would grab it at some point and stop it going forward.

Something else maybe, are you sure you have good neck tension and the bullet isnt being forced back when the round loads and somehow putting a slight bulge in the case, back beyond where the expander would have belled it? Does the round you pull out, look like it did when it went in? It wouldnt have to set back much to start to bulge the case. Maybe check your OAL on the dummys before you load and see what they are when you get them out.

With what youre describing, my experience has been they have been out of spec cases in some manner, and "most" of those dont go fully into battery either. Anywhere from "almost" and barely noticeable, to obviously not. When you had the problem, the gun was definitely fully in battery when it occurred?

No doubt theres always a chance that you have a chamber that was the last one cut on a worn out cutter, but if you dont have the problem with loaded ammo, factory or reloads, and it only happens with the dummy's/duds, then Id say the answer is your dummys. ;)
 
Do the 'stuck' dud rounds still plunk in the Gen 5---after you've gotten em out?

And when you plunk test, do you give the round a firm press into chamber with
thumb, before testing the 'drop free'...?
 
Hmmm. Is the firing pin possibly getting stuck in the primer pocket?

I think I still have some dummy 9mm, I fill try to duplicate this when I get home.

I did have a huge issue years ago when a lot of WWB 124 gr fmj had no flash holes in random rounds. When fired the primer backed into the firing pin hole, jamming everything up solid. I had to punch the side of the slide into the edge of a 4x4 post to break it free and get the gun back into action.

Stay safe.
 
Steve762us said:
Do the 'stuck' dud rounds still plunk in the Gen 5---after you've gotten em out?

And when you plunk test, do you give the round a firm press into chamber with
thumb, before testing the 'drop free'...?
Click to expand...
Yes they’ll plunk once I get them out. And yes I have pushed them into the chamber very hard, they drop right out. There seems to be no taper at the bottom of the chamber to seat the case in. It feels like a dead square bottom that the case sets on. I can push hard and rotate at the same time with no problems.
 
Riomouse911 said:
Hmmm. Is the firing pin possibly getting stuck in the primer pocket?

I think I still have some dummy 9mm, I fill try to duplicate this when I get home.

I did have a huge issue years ago when a lot of WWB 124 gr fmj had no flash holes in random rounds. When fired the primer backed into the firing pin hole, jamming everything up solid. I had to punch the side of the slide into the edge of a 4x4 post to break it free and get the gun back into action.

Stay safe.
Click to expand...
Ok you’re on to something. The slide will actually move back maybe .030 but the barrel won’t unlock and drop down. The firing pin is still protruding and the empty primer pocket looks to be hitting on the edge. This little dent was not in the case before I tested it. 679CCD01-876B-4AF6-95CA-BE4194EAC9BA.jpeg
 
So the gen4 must let the firing pin float back but the gen5 is locked forward in some way? Only breaking free when a round is actually fired? (I’m typing out loud🙂)
 
I’m guessing the gen5 would also lock solid had a dud primer been in the pocket.
 
Hartkopf said:
Yes they’ll plunk once I get them out. And yes I have pushed them into the chamber very hard, they drop right out. There seems to be no taper at the bottom of the chamber to seat the case in. It feels like a dead square bottom that the case sets on. I can push hard and rotate at the same time with no problems.
Click to expand...
Hmm...that all sounds good.

When you seat primers on your reloads, do you get the primer slightly below
the case head surface, even with the surface, or slightly proud?
 
Steve762us said:
Hmm...that all sounds good.

When you seat primers on your reloads, do you get the primer slightly below
the case head surface, even with the surface, or slightly proud?
Click to expand...
I seat below flush to whatever depth the pocket is but the dud rounds are the problem and they have open pockets.
 
I just made up a dud round and left a spent primer in the pocket. Apparently the firing pin bounced off of the spent primer because it ejected after pulling the trigger. That or it kept the firing pin from catching on the edge of the pocket.

So it seems if you want to use dud rounds in training with a gen5 Glock, you need to leave old primers in the pockets. If you’re using a gen4, no spent primer is needed.
 
Hartkopf said:
I just made up a dud round and left a spent primer in the pocket. Apparently the firing pin bounced off of the spent primer because it ejected after pulling the trigger. That or it kept the firing pin from catching on the edge of the pocket.

So it seems if you want to use dud rounds in training with a gen5 Glock, you need to leave old primers in the pockets. If you’re using a gen4, no spent primer is needed.
Click to expand...
I have not had that problem with my Gen 5 G19 MOS slide. I make my own dummy rounds. Some have no primer at all and some I fill the primer pocket with RTV.
 
12Bravo20 said:
I have not had that problem with my Gen 5 G19 MOS slide. I make my own dummy rounds. Some have no primer at all and some I fill the primer pocket with RTV.
Click to expand...
How new is your gen5 19? Both of my gen5s were first year production I believe. My 19 had the half moon cut in the bottom of the grip.
 
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