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Magpul PMAG 20 AR 300B GEN M3

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The PMAG 20 for 300BLK has the same features as our PMAG 30 AR 300 B, but its compact 20-round body allows for increased maneuverability and creates a more concealable package when used in small format firearms. Due to the wide variety of projectile weights and profiles, a dedicated 300 BLK magazine offers greater reliability and a safer way to feed your 300 BLK rifle. The PMAG 20’s distinct ribbed design and smoother upper-half texture also provide the shooter a distinct visual and tactile difference from any other PMAG to mitigate dangerous cross-loading issues. Along with optimized 300 BLK performance, the PMAG 20 also incorporates all of our advanced GEN M3 features.


  • Design optimized for maximum reliability using 300 Blackout® ammunition
  • Utilizes all PMAG Gen M3 5.56/300B compatible accessories
  • Unique rib design to provide instant differentiation from 5.56 mags in all condition

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