Magpul PMAG 40-Round GEN M3 AR/M4 Magazine

$21.80 $21.36
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(73 reviews)
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Magpul PMAG 40-Round GEN M3 AR/M4 Magazine


The next-generation PMAG 40 GEN M3 is a 40-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons. Along with expanded feature set and compatibility, the GEN M3 incorporates new material technology and manufacturing processes for enhanced strength, durability, and reliability to exceed rigorous military performance specifications.

While the GEN M3 is optimized for Colt-spec AR15/M4 platforms, modified internal and external geometry also permits operation with a range of additional weapons such as the HK® 416/MR556A1/M27 IAR, British SA-80, FN® SCAR™ MK 16/16S, and others.

The PMAG 40 GEN M3 features a long-life stainless steel spring, four-way anti-tilt follower and constant-curve internal geometry for reliable feeding, and simple tool-less disassembly to ease cleaning.

In addition, a redesigned bolt catch notch in the rear of the magazine provides increased bolt catch clearance, while an over-travel stop on the spine helps ensure the magazine will not over-insert on compatible weapons. Low profile ribs and new aggressive front and rear texture gives positive control of the GEN M3 in all environments, and a paint pen dot matrix has been added to the bottom panel of the body to allow easy marking by the end user for identification. The new, easy to disassemble flared floorplate aids extraction and handling of the magazine while providing improved drop protection, but is slightly slimmer than before for better compatibility with tight double and triple magazine pouches. An included pop-off Impact/Dust Cover can optionally be used to minimize debris intrusion and protect against potential damage to the top cartridge during storage and transit.

Made in U.S.A.


  • Next-generation impact and crush resistant polymer construction
  • Modified dimensions allow for wider compatibility with non Colt-spec platforms
  • Constant-curve internal geometry for smooth feeding
  • Anti-tilt, self-lubricating follower for increased reliability
  • Long life stainless steel spring
  • Over-travel insertion stop on the spine
  • Ribbed gripping surface and new aggressive front and rear texture for positive magazine handling
  • Paint pen dot matrix panels on the bottom of the body to allow for identification marking
  • Flared floorplate aids magazine handling and disassembly yet is slim enough for use with many double and triple pouches
  • Pop-off Impact/Dust Cover to minimize debris intrusion and for ammunition protection in storage and transit


  • 5
    Great deal

    Posted by Adam on 5th Sep 2021

    Exactly the quality I expected, quick delivery. Great experience as usual.

  • 5
    40 round gen 3 AR/M4 magazines

    Posted by Ted Calahan on 22nd Jun 2021

    These 40 round AR magazines I purchased from Arms Unlimited are not the first products I have purchased from Arms Unlimited. My experience with this company through multiple multiple purchases over these past couple years has always been very satisfactory. I have always received my products very quickly and the condition of all the products I have purchased from Arms Unlimited have always been really good. This is a company I have been ordering from for a few years and will continue to order from. I definitely recommend this company for everyone. 👍🏼ðŸ˜ÅÂ

  • 5
    No Issues

    Posted by Unknown on 12th Jun 2021

    Item arrived as described and in perfect condition.

  • 5
    PMAGS just work

    Posted by Unknown on 5th Jun 2021

    What else is there to say.

  • 5
    First rate

    Posted by Doc on 3rd Jun 2021

    Standard Magpul, it is a mag and it does what it is supposed to do.

  • 5
    Smooth transition

    Posted by Brian on 31st May 2021

    Nice price and good products thanks a bunch and will be back for more!

  • 5
    40 Round Pmag!!!!

    Posted by Zachary Magpul on 28th Jan 2021

    Really cant say anything bad about this perfect product.

  • 5
    Completely happy

    Posted by Chris peduzzi on 25th Jan 2021

    these are my favorite mags, and they sell them at a great price. Always fast delivery and respond to your every question. Thanks

  • 5

    Posted by gary owens on 11th Jan 2021

    like how light pmags are compared to metal