Magpul PMAG 20 AR 300 B Gen M3 20rd .300 AAC Blackout

The Magpul PMAG 20 AR 300 B GEN M3 is a purpose-built magazine for rifles chambered in .300 AAC Blackout. It offers a compact 20-round capacity in a black polymer body designed for AR-platform rifles, including AR-15 style lowers. The magazine’s distinct ribbed design and smoother upper-half texture provide a clear tactile and visual cue to help mitigate cross-loading with 5.56 magazines. The PMAG 20 incorporates GEN M3 features for improved impact and crush resistance and includes identification and protection details suited for regular range and field use. Made in the USA.

Key Specifications

• The capacity is 20 rounds.
• The magazine is designed for .300 AAC Blackout cartridges.
• The construction uses polymer for the body and components.
• The exterior finish is black.
• It is intended to fit AR-platform / AR-15 rifles.
• The model designation is PMAG 20 AR 300 B GEN M3.
• This product is a rifle magazine.
• Included GEN M3 features include impact- and crush-resistant polymer, removable slim floor plate, paint-pen dot matrix, and a dust/impact cover.
• The design has a ribbed upper section with smoother upper-half texture for tactile identification.
• The magazine is made in the USA.

Compact, purpose-built, and durable, the PMAG 20 GEN M3 provides a practical magazine solution for shooters using .300 AAC Blackout in AR-platform rifles. Its combination of a reduced profile, tactile differentiation, and GEN M3 durability features makes it well suited for compact rifle builds, training, and range use where reliable feeding and easy identification matter.

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