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Magpul 40 Round PMAG AR M4 Gen M3 5.56×45 Mag


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  • 40RD capacity
  • Black polymer construction
  • Anti-tilt, self-lubricating follower
  • Ribbed gripping surface
  • Flared floorplate
UPC: 873750009698 SKU: MGMPI233BLK Categories: , Tag: Brand:

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

  • 40 Round AR M4 Gen M3 features a long-life stainless steel spring
  • Four-way anti-tilt follower
  • Constant-curve internal geometry for reliable feeding
  • Simple tool-less disassembly for easy 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 polymer 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 be used to minimize debris intrusion and protect against potential damage to the top cartridge during storage and transit.

Made in the USA.

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Shipping Restrictions

This product is NOT sold/shipped in the following locations: CA, HI, MA, NY, NJ, MD, Chicago, IL, Franklin Park, IL, Oak Park, IL, Riverdale, IL, Aurora, IL, South Bend, IN. Check your local laws in your state as you are responsible for knowing your particular laws relating to high capacity magazines.

Please see our policy on shipping high capacity magazines.

Additional information

Weight 6 oz
Dimensions 14 × 10 × 1 in

1 review for Magpul 40 Round PMAG AR M4 Gen M3 5.56×45 Mag

  1. bp427.bp (verified owner)

    These magazines from Magpul really hold up. I accidentally stepped on mine and thought it would crack. Held up! Thank you AIT Arms too for having these in stock when nobody else did.

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Questions and Answers

    Will this magazine fit 300 Blackout rounds?
  1. 1 vote
    Q Will this magazine fit 300 Blackout rounds? answer now
    Asked by CourtneyC
    Answered by the admin

    Thank you for your question! The magpul pmag 40 will only work with .223 Remington or 5.56 Nato rounds.

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