Glock fans: Glock 21 Gen 4 trigger not resetting (stock connector)

[Whatisthis?]

I picked up my Glock 21 Gen 4 and took it out to the range. The first ~50-75 rounds went off fine, but then the trigger failed to reset. Then it happened another 5-10 times in the span of 100 rounds and then stopped for the last 50 rounds. I took it out again today and right from the start the trigger wasn't resetting roughly once a mag and sometimes even more.

Internals: The only thing changed internally was me polishing up the connector and trigger bar. I know not to actually remove material and I made sure by using a polishing pad. Night sights were added, but irrelevant.

Ammo: Yes, these were my reloads. Essentially it's 230gr Xtreme bullets, mixed range brass, CCI LPP, and Power Pistol powder. I've varied my charges from .2gr below max to .9gr below max. All reloading was done on a single stage press, doing one step at a time for each round.

Details: It was more frequent with the higher charges, but it still occurred with the lower end stuff as well.

Trying to keep this short so it's easier to read. Let me know if I forgot anything. And if you know a possible solution, please let me know. I doubt this is a reloading problem, but I could be wrong.

EDIT: One thing I forgot to mention that does make me think it could be the ammo is I cannot replicate the problem with the gun unloaded. Only through live fire have I actually experienced the problems

[_TomT_]

Sounds like when you took everything apart to polish the trigger you reinstalled the trigger return spring backwards. The correct way to reinstall the spring is to make sure the hook forms a letter "S" when looking at it from the right-hand side.

[Tripper]

Sounds like when you took everything apart to polish the trigger you reinstalled the trigger return spring backwards. The correct way to reinstall the spring is to make sure the hook forms a letter "S" when looking at it from the right-hand side.

I was going to say that, or, the trigger safety spring went back in sideways, or not at all

[Whatisthis?]

Sounds like when you took everything apart to polish the trigger you reinstalled the trigger return spring backwards. The correct way to reinstall the spring is to make sure the hook forms a letter "S" when looking at it from the right-hand side.

Just double checked to make sure I didn't accidentally do that backwards. The trigger spring is in the correct orientation.

I was going to say that, or, the trigger safety spring went back in sideways, or not at all

Trigger safety spring that is in the physical trigger that pushes the trigger safety out was never touched. The safety works as intended and has a fairly strong return (for a trigger safety at least).

The physical trigger spring as stated above is correctly installed.

[vintagearms]

Sounds to me like an ammo problem.

[_TomT_]

Do a field strip and take a picture of your trigger bar, the large bar that attached to your trigger. Mainly around the area where the bar comes into contact with the safety plunger(firing pin block).

I love how Glocks have a weird name for every part, I guess they want to be different.

[Tripper]

Glock fans: Glock 21 Gen 4 trigger not resetting (stock connector)

Just double checked to make sure I didn't accidentally do that backwards. The trigger spring is in the correct orientation.







Trigger safety spring that is in the physical trigger that pushes the trigger safety out was never touched. The safety works as intended and has a fairly strong return (for a trigger safety at least).



The physical trigger spring as stated above is correctly installed.

No, the little round button looking thing, in the slide, in the left channel looking at it with barrel forward, has a spring under it, if you push down on it, it depresses
That would have only been messed with if you took the firing pin out though, or the plunger anyway


Sent from iPhone

[Tripper]

watch this video

https://www.youtube.com/watch?v=No4SA6v6xjE

at about 7.32, is what I am talking about
if the spring under that, gets sideways or broke, it wont reset

[Whatisthis?]

I didn't disassemble or polish any of the slide parts, but that doesn't mean something wasn't weird from the factory, just less likely. I just checked the "safety plunger" (?) and it seemed straight and seated correctly upon disassembly. Here are the pictures of the trigger bar where it comes in contact with the "safety plunger."

[Whatisthis?]

Sounds to me like an ammo problem.

That's what I thought at first too and it makes sense it's not the glock because this isn't a common issue unless you change out the connector or put in a spring incorrectly. So it makes sense that it's the ammo... but how could the ammo cause the trigger to not reset?

[Tripper]

does the safety plunger depress and release easily

[_TomT_]

I've read some where that if that trigger bar is not in spec, or straight if a round goes off it would push it to the slide. This would cause it to not engage the striker bar and thus you would have the trigger not properly reset. This is why Glock decided to put that little bump at the nub of that bar.

[Tripper]

unloaded, how far do you need to rack the slide for it to reset, it should only take a bit.

[Tripper]

it doesnt look polished

[Whatisthis?]

does the safety plunger depress and release easily

Yes

I've read some where that if that trigger bar is not in spec, or straight if a round goes off it would push it to the slide. This would cause it to not engage the striker bar and thus you would have the trigger not properly reset. This is why Glock decided to put that little bump at the nub of that bar.

That makes sense. So even if mine was out of spec, that bump should still engage the striker bar and I shouldn't have this problem if it was the trigger bar. Right?

unloaded, how far do you need to rack the slide for it to reset, it should only take a bit.

<1" Pretty typical for the rest of my Glocks.

it doesnt look polished

Yeah, that's 400 rounds of Power Pistol loads with no cleaning and probably not the best polishing job to begin with. I just took a dremel with a polishing pad bit and some metal polish for until it looked somewhat smooth/shiny.