Glock Double Feed Cause?


March 13, 2009, 05:14 PM
Okay guys, I'd love some help in trying to diagnose a problem that one of my Glocks appears to be having!

I have a 2nd generation Glock 22 that was produced around 1995-96 or so, and it has functioned flawlessly for me for the last ten years. Anyway, I loaned this weapon to my roommmate, who is currently attending a police academy, and she is reporting a significant double-feeding problem as of last week (she says 6 double feeds in one 500 rd range session)!

I've run my head through the list of potential problems, and here's what I've come up with:

1) Possibly worn out mag springs. Gave her newer mags to use, don't know which ones she actually used, still reports the problem

2) Possible extractor problem. She reports to me that a range officer said the extractor is "chipped", though I didn't notice this the last time I looked at the weapon myself. Incidentally, she told me last week that the range officer was convinced it was the mag spring. Again, I wasn't there.

3) Possible limp-wristing, though I doubt that would actually lead to a double feed malfunction?

I'll obviously look things over more later tonight, but thought I'd see if you guys had any ideas for the most likely cause of a double feed malfunction in a Glock? I've owned three Glocks, and have been shooting these weapons for about 15 years. This is the first that I've ever had a malfunction in any of them, and unfortunately I haven't been there to see how it happened!

(yeah, yeah, I need to get out and shoot this thing myself, I just haven't had the time to yet).

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March 13, 2009, 05:59 PM
A double feed is when the spent round is left in the chamber, and a second round feeds into it. It is a nasty malfunction on any gun.

Since it is because the spent round is left in the chamber, or partly in the chamber, or possibly just not ejected, the extractor is the obvious culprit. The ejector could also be at fault, but one of the common failure points on Glocks is the extractor and a failed ejector usually results in stovepipes. Easy fix. Order one from or and change it out. Or, take it to a local Glock Armorer.

I'm not seeing any way for a magazine spring to be the cause of a double feed.

Just my thinking. You will get other ideas.

March 13, 2009, 06:44 PM
I agree with Snarlingiron. Replace the extractor. Be sure to get the right one for your Gen2, which may be a 90-degree breech face without the LCI (If you don't know what I'm talking about, contact a knowledgable armorer, or post pics of the top of your slide and extractor and we can help you find the right one).
Also, while highly unlikely, you should inspect the Depressor Plunger Spring for weakness/wear, which could potentionally cause double feeds as well.

March 13, 2009, 09:47 PM
It is most likely the extractor. You can use a Gen 3 extractor in a Gen 2 gun, you just have to replace the spring loaded bearing to the LCI version (loaded chamber indicator). Also check and make sure that the ejector has not broken loose from it's housing. The final possibilty is that your friend is not gripping the pistol hard enough which will cause a FTE, which in turn can cause a Type 3 malf.

March 14, 2009, 02:14 AM
Okay, so I got the gun back a few hours after posting this, and observed a small chip out of the bottom portion of the extractor. I tried running some dummy rounds through the gun, and had three double feeds out of one mag. Definitely an extractor issue.

Drove the gun over to the range at work tonight, and was able to get one of our guys to replace the extractor. Gun fires again :)

Thanks for the help everyone!

March 14, 2009, 02:44 AM
Good to here, hate to here about Glock problems :)

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