CMMG Mk4/AR15 5.7X28mm Magazine - 32rd

Manufactured by CMMG
Manufactured by CMMG
1 Review

In Stock

Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



These 5.7mm AR magazines have now been redesigned with a new look and a host of new features. To keep things simple in your range bag, these now have the caliber clearly labeled on them, as well as a new texture so you can tell them apart from your other magazines. These magazines have also had their followers and springs redesigned to allow for more reliable feeding in your 5.7mm AR. 5.7

  • 5.7x28 Caliber
  • 32 Round Capacity
  • Black Color

CMMG, who have long since been known for pushing innovation in the AR space, are now making it more possible to shoot the interesting 5.7mm caliber, a high-velocity round developed for personal defense weapons. These magazines are designed well to work with CMMG’s uppers of the same caliber and provide reliable function for those looking to explore this new and exciting caliber that boasts armor-defeating capabilities and high velocities out of short barrels. Taking advantage of a rugger AR platform, it is now much for affordable to shoot the 5.7mm than when it only came in the P90 and FN5.7 platforms. These magazines are what you need to get your AR in 5.7mm running reliably.
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Caliber Gauge5.7X28mm
Magazine Capacity32
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

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New & improved

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CMMG new magazines are great durable and light weight.