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Why did we choose PMAGs?

This is a question we get asked quite a bit. It seems like some folks don’t particularly care for them, but we like them for quite a few reasons. It’s important to note that all of the reliability testing we’ve ever done on our guns has been shot with PMAGs, including the 7,500 rounds we shot at SHOT Show Range Day on Monday.

From a reliability perspective, we have never had an issue. The real reason we chose PMAGs is actually related to something else about the magazine that people often forget: a big part of the reliable function of a gun is consistent maintenance of your magazines. The PMAG is so simple to disassemble and reassemble so you can regularly clean your magazine. Most malfunctions with a gun start with a magazine issue, so regularly cleaning your mags, especially if they hit the ground, is really important.

The other reason that we like PMAGs is the basepad size. If you run into a malfunction, sometimes the magazine can be difficult to remove, but a PMAG has a nice big, serrated basepad so you can get a good grip to pull it out. This is especially helpful if you have the optional magwell installed and need to do an emergency magazine removal, as you’ll still get adequate purchase to remove the mag.

33 Replies to “Why did we choose PMAGs?”

  1. Doug Wilson says:

    Will stock Glock G19 mags work in the MR918??.


      Yes, they sure will

  2. The Air Force should be commended for using the Army’s existing test data rather than conducting a redundant test to make its decision. The question that remains unanswered is why didn’t the Army come to the same conclusion as the Air Force and choose the PMAG when it appears that the service’s own test data shows the PMAG as the top performer.

  3. Alex s says:

    What size mags fit on the MR920?

    1. Jessica Roe says:

      It will take any Glock mags.

      1. Tony says:

        Glock 19 mags?

      2. Jessica Roe says:


  4. Landon says:

    I’ve had many issues with multiple brand new pmags that will fall out of the gun as I shoot it. Any suggestions to fix this problem? This happens no matter how o grip the gun, so it’s not me accidentally pressing the Mag release. All of the mags will work perfect and reliably in a stock Glock 19 but have issues with the MR918.

    1. Jessica Roe says:

      Landon, That doesn’t sound normal. Can you please email our Technical Team at support@shadowsystemscorp.com

  5. Eric Nixon says:

    What Generation Glock 19 Magazines fit the MR920, Gen 4 or Gen 5?

    1. Jessica Roe says:

      The mags are the same between generations, so any. All 9mm Glock mags will work with the MR920

      1. Mike Jorgensen says:

        My Glock mags fall out every time first shot. My Pmag mags fully function 100%..

      2. Jessica Roe says:

        Mike, that shouldn’t be happening. Please email my technical team at support@shadowsystemscorp.com

  6. Jonathan says:

    The magazine follower on my glock magazines does not engage the MR918 slide stop when the last round is fired, and the slide locks back into battery. This only occurs when firing, not when operating the slide manually. The glock mag follower recess for the slide stop lever just barely misses the lever. Is there anything that I can do? I like the round indicators on glock mags, and have a lot of them.

    1. Jessica Roe says:

      Hi Jonathan, occasionally the high firing grip that the MR918 enables causes shooters to inadvertently hold the slide release down, typically with their left hand if they are a right handed shooter. Have you tried firing the gun one handed to confirm this is not the issue? It doesn’t make sense to us that it would lock back manually, but not during live fire. Also, can you confirm how old your Glock mags are? We have seen that when the springs are old, they don’t push the follower fully into position. Does this issue happen with PMAGs that came with the gun? Please feel free to call our tech support, if that’s easier for you, so we can troubleshoot this issue: 469.458.6808

  7. Greg Miller says:

    Just got shadow system warrior poet edition. Just trying to chamber a hollow point it locks up every time. It new gun. Do I just need run some ref Ammo thru it then hollow points?

    1. Jessica Roe says:

      Hi Greg, will any ammunition chamber for you? Have you been able to fire the gun yet at all? We would like to further diagnose this problem, if you could please email tburke@shadowsystemscorp.com

    2. Greg W Johnson says:

      Mine is doing the exact same thing, It’s almost like the first couple that you try to chamber up are tilting.
      They are throwing them on a 45 degree angle. If you shuck it with more force they usually don’t have a problem.
      I noticed this also and went thru hollowpoint, then coated red federal to try some coated tips then just blazer. The blazer is the only one that didn’t lock up. (sometimes)

      1. Greg W Johnson says:

        Mine was on a SS MR 920 Elite though

      2. Jessica Roe says:

        Hi Greg, have you been able to fire any rounds through the pistol? If so, how many rounds? This could be a break in issue that will go away when you hit about 200 rounds, but if it is not something helped with break in or is causing you to be unable to chamber any rounds, then please email tburke@shadowsystemscorp.com to get more assistance!

  8. Jake Maughan says:

    I just purchased the war poet and went to a 4 hour defensive pistol course. Both pmags were completely unusable due to not feeding properly. I switched to a friends Glock OEM mag and didn’t have a single jam 300 rounds later. Popped the Pmags in and started jamming again. Sadly I was not impressed and neither were the 4 range instructors.

    1. Jessica Roe says:

      Hi Jake, I am sorry you are having that issue. That is not a report we have had before. Could you please email tburke@shadowsystemscorp.com so that we can further diagnose the problem?

  9. Scott Harss says:

    Have about 400 rounds through my recently purchased MR920 and I love the gun, but stock G19 magazines fall out of the gun while shooting. No issues with the PMags but the three Glock mags will not stay in the gun. I had two other people try the gun and the same thing happens, so it’s not my grip. Not sure what the issue is.

    1. Jessica Roe says:

      Scott, Thank you for letting us know about this issue. Sometimes magazine catches can deform or be out of spec. If you would feel comfortable installing it yourself, I can send you a new catch and spring. Or you can return the gun to us for repair. Please email support@shadowsystemscorp.com with your name, email address, and mailing address and we will get you fixed up!

      1. Scott Harss says:

        Thanks for the info. I would have no problem installing it myself, I will contact you with my information. Thanks again.

  10. eric cho says:

    will this model of magpul work with the mr918l elite ..MAGPUL PMAG17 GL9 10/17 FOR FULL SIZE DOUBLE STACK 9MM GLOCK PISTOLS or do i have to get MAGPUL PMAG 15 GL9– GLOCK G19

    1. Jessica Roe says:

      Hi, yes that model of magazine will fit and function. It will just hang out more than the 15 round mags the pistol shipped with.

  11. chris Acampora says:

    MR920 has a feeding issue on the first couple rounds. I’ve shot about 200-250 rounds through it and it still seems to not feed correctly. I have to force it into place. Has anyone else has this issue?

    1. Jessica Roe says:

      Hi Chris, can you please contact my Technical Team about this? You can reach them at support@shadowsystemscorp.com Thanks!

  12. Jason N says:

    Have Magpul L-plates (extended base pad) for the PMAGs been tested at all for compatibility with the MR/DR series? I find the magazines a little hard to grip at the stock PMAG baseplate if I use the mag well on my new DR920. So I’ve been leaving the mag well off. But I’d like to use it. The Magpul L-plate would seem to be a good solution since they’re especially fit by Magpul for the PMAGs.

    1. Jessica Roe says:

      We have not yet tested the L Plates.

  13. Kurtis says:

    I didnt realize the slide release lever was on the left side. I’m a lefty. Love my MR920. Is there any way I can change it to the other side? Please say yes.

    1. Jessica Roe says:

      Hi Kurtis, unfortunately, our design does not allow for the slide release lever to be swapped to the other side. Trevor did do a Technical Tuesday video discussing this, in case it’s helpful: Technical Tuesday: Why the Gen 4 Operating System? Ambi slide release?

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