The next-generation PMAG 40 GEN M3 is a 40-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons.
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MAGPUL MAG233-BLK PMAG 40 AR/M4 GEN M3 5.56X45 - For Sale
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MAGPUL PMAG 40 Rd GEN M3 Magazine for sale
MAGPUL PMAG .223/5.56 40 ROUND MAGAZINE, GEN-M3, NEW #3-12151-PF - Checkpoint Charlie's