Magpul PMAG 20-Round GEN M3 AR/M4 Magazine

$14.20 $12.00
(You save $2.95 )
(50 reviews)
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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. 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.

Similar to the MOE PMAG, the GEN M3 features a long-life USGI-spec stainless steel spring for commonality, 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 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 additional protection in storage and transit


  • 5
    Magpul PMAG 20-Round GEN M3 AR/M4

    Posted by Unknown on 31st May 2021

    Magpul says it all

  • 5
    For my new build

    Posted by Daniel Olsen on 15th May 2021

    Pmag what can you say

  • 5
    It's a pmag

    Posted by Joe on 11th May 2021

    It's a pmag

  • 5
    Excellent Magazine

    Posted by Gtjim on 6th Apr 2021

    What can I say.. excellent magazine... works fantastic with no problems. Easy to load and to lock into the gun.

  • 5
    \Magpul PMAG 20-Round GEN M3 AR/M4 Magazine

    Posted by Dan Travertini on 28th Dec 2020

    I found the product price lower than most competitors, so I ordered 3 p-mags for my son. A day later I received a tracking notice, and after another three days I hit the tracking number which said my package was delivered by UPS to a front desk in New Jersey. I then looked everywhere for a phone number for Arms Unlimited site and could find nothing but a an e-mail address. I wrote that possibly they had mis-labled my order which ended up on the east coast. A rather curt reply came which showed a picture of the shipping lable which had the correct address, but no explaination of why it was in New Jersey. There was included a comment that the shipper wasn't UPS but USPS, even though the tracking numner was definately UPS. As I discovered, UPS carries the package to a point, then transfers it to USPS mail to complete the delivery which took about 3 weeks. My experience with this company is that I will probably not use them in the future.

  • 5
    Magpul Pmag 20rd GenIII

    Posted by Rick Wagner on 11th Nov 2020

    Excellent magazine! Size is perfect for bench shooting and the dot matrix makes it easy to label or number your magazines. I am using them with 300 Blkout and they feed with zero issues.

  • 5
    Magpul PMAG 20-Round

    Posted by James Bell on 25th Oct 2020

    Great mag and a Great price

  • 5
    magpul pmag 20 round

    Posted by mark snook on 20th Oct 2020

    best price around!

  • 5
    Good Price and fast delivery

    Posted by Craig Iwaishi on 19th Oct 2020

    First time ordering through Arms Unlimited. Order arrived a must a few days.