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Old April 28, 2009, 08:22 AM   #1
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Join Date: March 29, 2009
Location: Australasia
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Glock high-capacity mag problem

A new shooter asked me to make this post for her, after she brought me a new 30-plus-round aftermarket magazine she purchased for her Glock 19.

It appears that she had loaded the mag up to capacity at the range, and managed to fire off six or seven rounds before the magazine (not the gun) failed.

When I looked at the rather long, all-metal magazine (not polymer-coated and obviously not factory-Glock) I discovered that the cartridges had nose-dived into the magazine’s front wall, and were effectively stuck. No amount of shaking would dislodge them. Not wanting to deform the magazine’s feed lips by attempting to remove the cartridges from above, I removed the base plate (under high spring tension) and extracted the remaining 9mm’s from underneath. (There were well over 20 cartridges left inside.)

The magazine does not appear to have any welded seams on the front wall, but was too long to “feel through” to detect any roughness on the inside, even with the spring and follower removed.

Question is, is this a standard occurrence in mega-capacity magazines like this, or did our newbie friend just pick up a lemon? One wag suggested that it was a faulty design to start with, pointing out that 30-round mags in machine pistols like the UZI are always perfectly vertical, not slanted like this particular example.

Was he correct? (Newbie will be monitoring this thread for any insights/helpful advice you can provide.) The best I could advise her was to tap the rear of the magazine against her palm for every 5 rounds she loaded (six taps in all).
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Old April 28, 2009, 08:51 AM   #2
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The problem is with the mag manufacturer, not with the concept of an extended Glock mag. Factory Glock 33 round mags tend to work flawlessly.

Was this a USA Mag? They are notorious for having significant issues.
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Old April 28, 2009, 09:19 AM   #3
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Hi, buzz_knox!

Yes, in fact it is!

Is there any thing that can be done to make them more reliable?
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Old April 28, 2009, 01:23 PM   #4
Join Date: March 7, 2009
Location: SE Kansas
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Hi rauke, It has been my experience that the magazine is the most likely componet to fail in a semi-auto firearm.

Sounds to me like the follower is rotating and this should not happen unless it is 1. broken, or 2. not designed with enough support to keep it level under tension.

As buzz knox states the glock mags work very well even in the "higer capacity" models.

I don't know of a fix as such for the USA mag. but newbie may want to spend a little extra and get a mag that has proven itself dependable.

On the brighter side it makes good training for malfunction drills!
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Old April 28, 2009, 01:36 PM   #5
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Good one, K472!

Sounds like number 2, actually!

I know that she isn't going to be thrilled to find out that her equipment selection was at fault, but thanks very much for putting a positive spin on the issue.

Practicing malfunction drills!

Now why didn't I think about that! And on an otherwise boring, always-reliable Glock, no less! I hope she's picking this up...

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Old April 30, 2009, 10:43 AM   #6
Join Date: June 20, 2008
Location: Raleigh NC
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what is the need for a 30rd pistol mag? i dont trust most after mkt 'toys' and run almost all my guns 100% stock save for sights.

run factory mags and be done with it. have her run thru TRB drills with snap caps..but if she sticks to factory mags there will be little need as i rarely have issues with factory mags in my glocks...and i am not nice to mine.

ditch the garbage and stick with what works.
Observe. Overreact. Destroy. Apologize.
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Old April 30, 2009, 11:20 AM   #7
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There may be on need for the 30+ round magazines, but the FACTORY 33 round mags are every bit as reliable as the factory 15 round magazines. Some after market mags work fine. Some don't. I,ve not seen any of the 30+ aftermarket mags work.
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Old May 3, 2009, 07:59 PM   #8
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Since it's a USA magazine, my sincere advice is to scrap it. If you want an extended mag, get the factory Glock 33 round mag. Cut your losses, it's not worth the frustration.
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