The PMAG 20 AR 300 B GEN M3 is a magazine designed specifically for rifles that are chambered in .300 Blackout® (300 BLK). Unlike the PMAG 30 AR 300 B, this magazine is compact and allows for greater maneuverability. Its smaller size also makes it easier to use in small format firearms, providing a more concealable package.

Until the creation of this magazine, shooters had to rely on magazines designed for other cartridges, which limited the ultimate performance and compatibility of the 300 BLK round. Although 300 BLK cartridges were compatible with 5.56x45mm magazines, doing so could compromise the reliability and safety of the rifle. Therefore, a dedicated magazine like the PMAG 20 AR 300 B is a much better solution for the 300 BLK round.

Apart from dedicated 300 BLK performance, the PMAG 20 AR 300 B is designed with distinct visual and tactile differences from other PMAGs, making it easy to avoid dangerous cross-loading issues. Its ribbed design and upper-half texture provide a clear difference for the shooter.

Incorporating all of the features of the GEN M3 line, the PMAG 20 AR 300 B is made with a next-generation impact and crush-resistant polymer, an aggressive front and rear texture, an easily removable slim floor plate, a paint pen dot matrix for marking and identification, and an impact/dust cover.

This magazine was made in the USA and has a capacity of 20 rounds. It is compatible with most 'STANAG 4179' platforms such as the AR15/M4, FN SCAR, IWI Tavor, and others. The PMAG 20 AR 300 B GEN M3 is an ideal solution for anyone looking for a dedicated and reliable magazine for rifles chambered in 300 BLK that supports the differing geometries found in that caliber.

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