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  1. #1

    Default Another SA Friday Ed Thread; Glock Mags

    This has come up twice in the last three days, so I thought I would post a thread about some of the info I've come across over the years about Glock Mags.

    First and foremost, all Glock mags of the same caliber have the same dimensions from the bottom of the mag retention notch to the feed lips. What does this mean? It means a G22/35 mag will fit into and function in a G23 or G27. A G23 mag will fit into and function in a G27, but won't work in a G22 or G35 as it's too short to work. This works for all the various Glock models. As long as the caliber is the same, the longer mags function in the smaller guns. Why would anyone want more than one or two G26 or G27 mags? I don't know. I carry a G23 or G22 mag to reload to with my G27 when I carry.

    Second, The above concept doesn't work if you convert a G20 to 40 S&W. No Forrest, the G22 mag won't work in the G20 once converted.

    You CAN get G17 and G22 and G20 and G21 mags to carry more rounds. There are three companies that make extensions for these mags that I trust; Taylor Freelance, Arredondo, and Dawson Precision. You know those one and two round extenders you see all the time? Complete junk. Don't bother with them. I've seen those things cause more Glocks to puke or explode on the impact with the ground during a reload... They just are not quality products. The three above work. If you do extend a mag with these extensions, you have to change the mag spring to a Wolfe +10% spring. If you don't the spring will be too short and too weak to operate reliably. The pay off is +5-6 rounds of 9mm and +4-5 rounds of 40 S&W.

    If you have to take your glock mags apart to clean regularly, you know those little tabs on the top of the side rails on the body of the mag for the floor plate make disassembly a real pain in the ass. All the mags I use for competition, I take the floor plate off and then use and Exacto blade and CUT THEM OFF. In 7 years of doing this, I have never lost a floor plate or had one even come loose with the tabs removed. They are a needless example of over-engineering. I've wore out glock mags in one years of shooting. That's how many times they get dropped, stepped on, kicked, dirt, mud... Never lost a plate.

    Glock mags will wear out. When the sides bulge to the point the mag will not drop free, either throw it away or set it aside for practice only. You cannot bend it back into working shape. Trust me on this, I've tried. The mag is shot. Don't use it for anything you want it to fall free during.

    Any Glock mag that has a U shaped cut in the back on top is junk. Throw it away, NOW. These are the old "won't drop free, and will screw you in the butt when you need it to drop free every time" mags. Rid the earth of these mags.

    Any mag made for Glocks NOT made by Glock is junk. Once again, rid the earth of these.

    Glock mag feedlips WILL spread in the front after lots of use, especially the 40 cal mags and the 45 cal mags. If you have used mags that constantly jam, the feel lips are probably spread out. Rid the earth, replace. Bend all you want, they will spread in two or less uses...

    Glock mag springs WILL die. You leave the mag loaded in the safe, you kill the springs after about 6 months. There are no magical mag springs out there that never die. This is a myth. I've heard this myth perpetuated for years now. No magical springs, replace the mag springs regularly and you will be fine.

    Glock numbers their followers. The bigger their number the newer version they are. I have yet to find any design that works better or worse than the other as long as it came from a mag with the square notch on top instead of the U notch.

    Don't use lubricants or oil on a Glock mag, EVER!!! Run it dry.

    Basically, if in doubt, throw the mag away and buy a new one. Glock mags are cheap and there is no reason to run a bad mag. Besides if you are not shooting enough to wear out a mag or two during the year, you probably are not shooting enough.
    Mom's comin' 'round to put it back the way it ought to be.

    Anyone that thinks war is good is ignorant. Anyone that thinks war isn't needed is stupid.

  2. #2

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    good info, thanks

  3. #3
    Bang Bang Ridge's Avatar
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    True, true...I conceal carry this:


  4. #4
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    Well said.

  5. #5
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    Any mag made for Glocks NOT made by Glock is junk. Once again, rid the earth of these.
    That's for darn sure! +1. Folks, don't be tempted by these 8-9 dollar Korean mags. They're fine for range practice, but DON'T USE THEM FOR CARRY MAGS!

    Glock mag springs WILL die. You leave the mag loaded in the safe, you kill the springs after about 6 months. There are no magical mag springs out there that never die. This is a myth. I've heard this myth perpetuated for years now. No magical springs, replace the mag springs regularly and you will be fine.
    OK, this is the first I've heard of this. I don't think it's accurate. From everything I've researched, it's not leaving rounds loaded in any magazine that causes damage, it's the constant reloading and unloading that weakens springs in any magazine.

  6. #6
    Angels rejoice when BigBears trumpet blows
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    Rgr that SA. Good writeup. I have the two that came with the wife's G26, and then she has 2 hi-caps for my G19 that work great in the G26 as backup.

  7. #7
    Zombie Slayer MrPrena's Avatar
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    Quote Originally Posted by Driftwood View Post
    That's for darn sure! +1. Folks, don't be tempted by these 8-9 dollar Korean mags. They're fine for range practice, but DON'T USE THEM FOR CARRY MAGS!



    OK, this is the first I've heard of this. I don't think it's accurate. From everything I've researched, it's not leaving rounds loaded in any magazine that causes damage, it's the constant reloading and unloading that weakens springs in any magazine.
    +1

    ETA: BEst way to find out the myth is to have 2 mags loaded.
    Have 1 mag kept loaded for 6 month. Another one to be loaded and unloaded every week.
    Then, take the mag spring out after 6month from those 2 mags and apply same mass on top.
    Whichever compresses more is the loser.


    There is better way to calculate this, but more math involved. Don't feel like doing math at 92F today....

  8. #8

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    Quote Originally Posted by Driftwood View Post
    That's for darn sure! +1. Folks, don't be tempted by these 8-9 dollar Korean mags. They're fine for range practice, but DON'T USE THEM FOR CARRY MAGS!



    OK, this is the first I've heard of this. I don't think it's accurate. From everything I've researched, it's not leaving rounds loaded in any magazine that causes damage, it's the constant reloading and unloading that weakens springs in any magazine.
    Nope. By leaving them loaded for long periods you are setting memory into the coils, memory of full compression. I have fixed dozens of Glocks at various ranges over the years by simply disassembling the mag, stretching out the spring and reassembling. Every time, the mag was left loaded in the nightstand for at least half a year. Stretching them only works for a little while, and then they start crapping the bed again. This is consistant with any gun mag, not just Glocks. Loading and unloading the mags has it's amount of wear and tear on the mags too, but not even close to leaving the mag fully loaded for months on end. If what you are saying is true, wouldn't Glock store, ship, and recommend leaving the mags fully compressed? They don't.
    Mom's comin' 'round to put it back the way it ought to be.

    Anyone that thinks war is good is ignorant. Anyone that thinks war isn't needed is stupid.

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    Any other wives tales to share?

  10. #10

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    Quote Originally Posted by Ridge View Post
    True, true...I conceal carry this:

    OH YA! This picture reminded me of another tidbit of info. Those stickers on the side of the mags that the factory puts on there or the wholesaler puts on there... I've seen them roll in to a nice ball upon insertion into the gun's magwell and jam that mag nice and tight up in there. Take them off and if there's residual stickyness, clean it off with rubbing alcohol or Goo-Gone. Goo-Gone is made from citric acid and works better than anything I've found for this. Smells like oranges too, mmmmm.
    Mom's comin' 'round to put it back the way it ought to be.

    Anyone that thinks war is good is ignorant. Anyone that thinks war isn't needed is stupid.

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