Magpul PMag 20 round AR/M4 Gen M3 5.56/45MM NATO (.223)

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The next-generation PMAG 20 GEN M3 is a 20-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons, designed for use when you want a more compact platform.  Great for prone position shooting.  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.
Similar to the MOE PMAG, the GEN M3 features a long-life USGI-spec 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.


  • 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 USGI-spec 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
  • Made in U.S.A.

5 Reviews

5 Reviews
  • 5
    Best Mag

    Posted by Timothy Couch II on Mar 4th 2024

    Best mag purchase ever. Nice quality mags for my gun. Looking forward to buying more soon.

  • 5
    MAGPUL PMAG 20 ROUND AR/M4 GEN M3 5.56/45MM NATO (.223)

    Posted by Freddy on Feb 19th 2023

    Perfect fit for my Saint Edge

  • 5

    Posted by William VILLERS on Jan 14th 2023

    As always with Magpul mags, it's a perfect fit and perfect operation. These are used with the excellent Hellion rifle, which make the platform even more compact and maneuverable than with 30 round mags.

  • 5
    Magpul 20 round Saint magazine

    Posted by Jerome Crabtree on Nov 13th 2022

    No feed issues and works as it should. Never had issues with Magpul products.

  • 5
    Magpul 20 round AR Magazine

    Posted by Jerome Crabtree on Oct 24th 2022

    Bought 5 of these. All 20 rounds fit in all 5 with no loading or feeding problems. Never had issues with Magpul products. Glad Springfield Armoury carries Magpul products.