Try a factory connector if you have one, just to eliminate that possibility. More likely than a barrel issue. Unless it is a short headspace somehow causing a slam fire.

 

Something is knocking your FP lug off the cruciform. Either the connector is not raising up the cruciform bar high enough on reset or there has been metal removed on the lug or cruciform or both.

This seems more likely than a caliber issue to me. Do you know the history of the gun?

 

Hi Peng,

I am the original owner and also installed the Ghost connector. I had trouble with the first connector... if memory serves, the trigger would not reset. Ghost sent me another connector and everything seemed fine up to this point. The gun probably has less than 500 rounds down range... mostly 357 Sig with maybe a hundred rounds each for 9mm and 40 Cal.

I suspect you and KenMI are probably pointing in the right direction.

 

Your gun is broken. Maybe too much elbow grease with a 25 cent trigger job? Start by replacing the connector and trigger bar. If you polished your firing pin lug, you might have to replace that too.

 

It certainly sounds like the connector. More specifically the angle the connector needs as installed to raise the trigger bar on reset is probably too shallow. If you have the OEM part just compare them, the difference should be obvious. Maybe think about not not shooting this gun again also - if you are only getting doubles you are lucky.

 

Awesome. Auto double tap!!! Good job.:50cal:

 

BE CAREFUL !!!!!

My Gen 1 "AF" 17 did a few double taps in 1990 at the range before going full auto the same day.

Old black internals were quickly replaced by Glock Inc. in Smyrna the next day, I live in metro Atlanta.

Then you have the public posting of an unregistered machine gun.

I'm not trying to be a party pooper.

 

BB's third sentence above succinctly encapsulates the real problem here. Perhaps you're unaware of how seriously BATFE takes this stuff, but that thing would be out of my possession today and I'd take down my post right now.

 

Is there a $.25 trigger job you forgot to include in the first post? A little polishing on the trigger bar and/or the striker lug?

 

I would probably waste no time in discarding some non stock parts and/or polished parts and replace them with OEM parts.

 

I would return the gun to 100% stock and destroy all of the parts you replaced.

 

Hi All,

I have a G31C for which I also have Lone Wolf barrels in 40 Cal and 9mm. With the 9mm barrel in place and using G17 mags, I occasionally get a two shot (machine gun like) burst. I guess I should also mention I have a Ghost 3.5 pound disconnector in the firing mechanism. It occurred to me that maybe the G31 slide return spring is too heavy for the 9mm and introduced an anomaly. But (as most of you probably know) when I went to purchase a G17 return spring, the same spring is used in most of the full sized Glocks, including my G31.

I don't remember the two shot burst when shooting 40 caliber or 357 Sig but when I shoot 9mm through it, the folks at the range think I have the world's fastest double tap!

Any suggestions (besides the obvious "only use Glock barrels in Glock pistols!")

Thanks!

Go back to the 5.5 connector and use a 6lb trigger spring.

:thumbsup:

 

If you have a 4lb. striker spring add that to the mix and see what YOU think. It's my current carry package after removing a 3.5 connector- just too much mush with it!!

 

If you have the stock parts go back to them and change out one part at a time to see what may have caused this. If you can not find out then keep the original parts in the gun.
Too much money and possible other problems to go with these after market parts.

 

Many thanks for all of your replies!

I replaced the Ghost Connector with the stock piece. That was the only change made to the firing mechanism. I'll hit the range, tomorrow, and report back.

Thanks again!

 

Just removed a Ghost 3.5 connector doing the same thing. Went with factory connector and runs fine.

 

If you have a 4lb. striker spring add that to the mix and see what YOU think. It's my current carry package after removing a 3.5 connector- just too much mush with it!!

Since I started using the 4.5 lb striker and 6lb trigger spring in my Glocks, I will never buy another 3.5 connector. I only use the 5.5 lb connectors now.

With my combo, the 3.5 connector is not needed.

 

The factory firing pin spring and trigger spring were balanced.
Now the trigger spring is 1.33 times as strong as the firing pin spring and with time "May" cause trigger reset issues.
If you go with a 4# firing pin spring and 6# trigger spring you will have reset issues sooner.
There is a reason Charlie Vanek Does Not Recommend using 6# trigger springs.

 

I know that this never really happened and it through this was just an example of fiction but I would replace anything the may have contributed to this fictionalized account and get rid of those other things

 

I appreciate the concerns of several of you relative to an experience that might be misconstrued as illegal. However,
if I had any intention of illegal behavior, I certainly would not have posted my experience in an open forum. My purpose in sharing a Glock problem with Glock enthusiasts was, through your collective knowledge, to find out how to rectify an unsafe and unwanted condition. Your suggestions relative to my Glock have been heeded and I'm off to the range tomorrow to be sure the weapon is indeed safe and legal. Any additional problem with the gun and it will go directly back to Glock.

Again... thanks to all of you for your collective suggestions!

 

The gentlemen is asking for help identifying how to correct the problem not the legalities of his problem. OP I would start with the connector and go from there. Best of luck.

 

WE TOLD HIM , REMOVE OFFENDING PARTS REPLACE WITH STOCK, GET RID OF THEM , SIMPLE AND INEXPENSIVE.

 

Sorry for bumping such an old thread but the exact same thing happened to me with my Glock 19 yesterday at the range..........(double fires for two entire magazines).

I saw (FINALLY) that the trigger was not resetting.......then this morning I came here.

It looks like I go back to the 5.5 OEM connector and that would probably fix the 3.5 Ghost problem.

Question is.........WHY did that all of a sudden happen when the first 200 rounds reset the trigger properly!!??

I don't get it. (And I hope going back to the OEM connector works.)

 

Question is.........WHY did that all of a sudden happen when the first 200 rounds reset the trigger properly!!??

I don't get it. (And I hope going back to the OEM connector works.)

Parts were wearing in. Or more correctly, wearing in wrong.

 

What about the "Double Diamond" 3.5 pound connector? I like the reduced pull of the 3.5.

 

If it works for you with no problems, then it works, no problem.
I shoot a G-17L, with no mods except for a Fiber Optic front sight.
This doesn't cause any changes to the Trigger Group.
I think the Connector is a factory installed 4.5, or "-"
It works fine and is smooth, but it has several thousand rounds to Polish the works. My G-21 has a - connector, an extended slide release, and Hogue Handall grips. It has several thousand rounds down range also, and is as smooth as can be.

 

I see so it can sometimes be a "trial and error" thing?

ETA: Oh, where do I get this "factory 4.5#" connector.....link?

 

Not trial and error if you keep to the Glock parts and recommended combinations.

 

It's the Ghost connector. Just DQ'd a guy at last weeks USPSA match when his gun tripled. I asked had it ever done that before, "no, not until I put the Ghost in it" And how much experience do you have with a Glock? Oh, this is my first one......

That's why the Ghost Man say "A Glock Armorer or Gunsmith should install these parts but anyone can do it" Apparently not very successfully from what I've seen, seems like every few weeks someone shows up a match with one.

Good luck trying to get a certified Glock armorer to put one in..........

 

Another possible cause of intermittent doubling is that one of the frame rails has sheared off (typically the left rear). This can cause enough lift in the slide for the striker lug to slip off the cruciform with or without modified internals.

Just something to be aware of from personal experience - especially if you haven't taken the slide off the frame since the doubling occurred.

 

Thanks for the heads up.

I took apart the gun yesterday and everything was installed properly, no twisted spring in the plunger going into the extractor area, firing pin in properly, connecter in properly, etc.

The trigger resets when testing it by holding it down while cycling the slide, etc.

Something else is wrong and I just plain do not know what it is. I am stumped. Some angle or area of a part needs to be bent or fitted in some other way so the trigger bar resets the trigger.........I don't know what that is though.

Wish I did.......LOL!

 

I have that happen to me a few times, but not with a Glock. Nothing was wrong with my gun, a 1911. I had an experienced shooter at the range help me, and it turned out to be me. He helped me adjust my grip, and that stopped the problem from happening again. (One of the times was scary, because it was more than a double tap).

Bottom line, it could be a problem with your gun, but it also could be you. Maybe have someone else who is an experienced shooter try out your gun, and see if it happens to him/her.