Reliability of using extended mags in Glock subcompacts?


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Good&Fruity
May 8, 2011, 05:32 PM
Has anyone noticed the "play" when using a larger mag in a Glock Subcompact? It seems as though this would cause issues with reliability, as a grip on the extended mag can cause the mag to tilt forward and down.

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1KPerDay
May 8, 2011, 05:34 PM
they work for me...

Nushif
May 8, 2011, 06:01 PM
This hang-up with zero tolerance for play is kinda odd, I think.

Friend of mine has one he uses for competition even and it's never failed him. Most guns that rattle a little bit are quite reliable, and frankly I'm starting to wonder where this "good gun = no play" thing is coming from.

So, to answer your question: Works good enough for three gun, it seems.

ny32182
May 8, 2011, 06:03 PM
There is the same amount of play regardless of whether you are using a flush fit mag or a longer mag in a Glock.

gym
May 8, 2011, 06:04 PM
Works for me 15 yrs

Loosedhorse
May 8, 2011, 06:09 PM
I've experienced a lot of NPs using G17 mags in a Glock 26...

"No Problems." ;)

Good&Fruity
May 8, 2011, 06:18 PM
There is the same amount of play regardless of whether you are using a flush fit mag or a longer mag in a Glock.

Maybe, but it doesn't come out to the same as using a larger mag in the subcompacts. With a Glock 19, you can use a 15rd mag or a 17 rd mag and never notice the play because you have a full grip on the PISTOL, never touching or pushing the mag with your fingers or hand.

With the subcompacts, when you put a 15rd or 17rd mag in it, due to the shorter grip of the pistol, you end up pulling on the front of the magazine unwittingly. This causes the magazine to dive forward a bit.

I've only had a couple of malfunctions with 33rd mags, and even then once or twice, rarely. But each time I noticed the bullet dived down and failed to feed. I couldn't help but wonder if it was the play, and my grip on the extended mag pushing the nose down.

Good&Fruity
May 8, 2011, 06:20 PM
Looks like most have not had any issues. I haven't had any either that I can definately attribute to this. But I was tinkering with it and got to wondering...

ny32182
May 8, 2011, 06:24 PM
I doubt that is what it is. If your pinky is pushing a 33rd mag, it is definitely going to be pushing the baseplate of a 10rd mag. Note that there is actually a gap between the baseplate and the frame, so if there were any effect from touching the mag it would be the same regardless of mag size.

To see how little movement there actually is at the top of the mag, just take off the slide, stick a mag in the frame, and push it around. The longer the mag, the more movement the end of it will appear to have, but the movement at the feed lips will be very minimal and identical regardless of mag size.

ChCx2744
May 8, 2011, 06:27 PM
Maybe, but it doesn't come out to the same as using a larger mag in the subcompacts. With a Glock 19, you can use a 15rd mag or a 17 rd mag and never notice the play because you have a full grip on the PISTOL, never touching or pushing the mag with your fingers or hand.

With the subcompacts, when you put a 15rd or 17rd mag in it, due to the shorter grip of the pistol, you end up pulling on the front of the magazine unwittingly. This causes the magazine to dive forward a bit.

I've only had a couple of malfunctions with 33rd mags, and even then once or twice, rarely. But each time I noticed the bullet dived down and failed to feed. I couldn't help but wonder if it was the play, and my grip on the extended mag pushing the nose down.

+1

I also noticed that any larger cap mags in the compact or standard work fine, but in a subcompact it goes forward a bit due to the pinky grip. I haven't had a single malfunction in my subcompact using 15, 17 or 33 rounders, but the mag play does make me curious as to how much of an impact the forward pressure may have on feeding. I think the only reason it fed okay in my case is because I only used FMJ rounds in the 33 rounders. If I used a more popular defensive JHP load, I may have experienced a malfunction, maybe not. What kind of ammo were you using when the malfunctions happened in your subcompact?

Good&Fruity
May 8, 2011, 06:47 PM
I doubt that is what it is. If your pinky is pushing a 33rd mag, it is definitely going to be pushing the baseplate of a 10rd mag. Note that there is actually a gap between the baseplate and the frame, so if there were any effect from touching the mag it would be the same regardless of mag size.


This is incorrect. When using a flush 10rd mag, your pinky rides underneath the magazine. It is not pushing/pulling it back like it would be with a 15 or 17rd magazine. That pushing/pulling is what causes that magazine to dive down at the nose a bit. But apparently it doesn't seem to be causing issues for anyone, so it must have lose enough tolerances to not matter.

Good&Fruity
May 8, 2011, 06:52 PM
+1

I also noticed that any larger cap mags in the compact or standard work fine, but in a subcompact it goes forward a bit due to the pinky grip. I haven't had a single malfunction in my subcompact using 15, 17 or 33 rounders, but the mag play does make me curious as to how much of an impact the forward pressure may have on feeding. I think the only reason it fed okay in my case is because I only used FMJ rounds in the 33 rounders. If I used a more popular defensive JHP load, I may have experienced a malfunction, maybe not. What kind of ammo were you using when the malfunctions happened in your subcompact?

I was actually using FMJ as well, WWB 115gr to be specific. It only happened once to twice, and towards the end of the mag when it was nearly empty. It did also seem that the spring was a tad weak there too, but the issue went away next time. It did only happen a couple of times, but it still got me to thinking.

I shoot with the extended 15/17rd mags, both Korean AND factory, and have no issues, even doing defensive drills with a convulsive grip. But sitting here putting one in, and pushing it back, you can tell there is considerable play, and that the nose of the bullets do dive down when you do this.

It got me to thinking if the malfunctions
I had with the 33rd factory mags a couple times wasn't due to this, as when I stopped to see what the stoppage was, the rounds had nose dived and failed to feed. Hmmm...Must have been a fluke. I have heard the 33rd mags do tend to be a little bit less reliable.

Mac Attack
May 8, 2011, 06:52 PM
No problems running a G21 mag in my G30.

Animal Mother
May 9, 2011, 09:29 PM
I've had a jam in my G19 using G18 mags, but it was within the first couple hundred rounds of using the gun, with WWB so I chalked it up to the break-in period, but its worth mentioning.

GCBurner
May 9, 2011, 09:35 PM
No problems running a G21 mag in my G30.
Same here. I did get the sleeves for the Glock 21 mags, so they have a closer fit in the Glock 30; there's still a bit of play, but they function fine.

dirtykid
May 9, 2011, 11:12 PM
Uhh, yea when i drop the "factory" Glock extended mag into my G27 it seems to "wiggle" a tad, dosent bother me but i do notice it to wiggle more than the factory mags that i put "extensions" on,, But i traded mine for a SP101 so no more worries !!

Jonah71
May 16, 2011, 05:54 PM
I have a 33 rnd mag. that works in my G 26 just fine, but I've only used it once at the range. Even then I didn't get crazy and rapidly empty every round, although I'm sure the little glock could have handled the heat, there was just no point in it. I bought it simply because I don't think they will be available for long and I "collect" things. I plan on owning a G 17 and 19 eventually and it won't look quite as strange in them. There was a little "play" but it functioned just fine. I also have a 17 rnd that works fine too. Both mags are great for people who are lazy and don't like to reload as often. J/K

TheProf
May 16, 2011, 09:26 PM
With the G26...the extended mag (15 round) is not a problem.
With the G27...the extended mag may cause a failure to feed once every 100 rounds.

When the extended mag is accidentally depressed due to the short grip of the subcompact, it seems that the larger caliber G27 (.40) in a 9mm frame has less room for error than the G26.

For me...it seems that my pinky finger tends to press on the extended mag too much perhaps causing the failure to feed 1 % of the time.

When I switched to only using standard mags on my G27, I have had 600 rounds of zero problems (even when firing one handed). I first thought it was a "limp wristing" issue... but I can fire the G27 purposely limp wristing and it was good to go... as long as I used the standard stock mag.

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