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The next-generation PMAG 40 AR/ M4 Gen M3 is a 40-round 5.56×45 NATO (.223 Remington) polymer magazine for AR15/M4 weapons. With expanded feature set and compatibility, the PMAG 40 AR/M4 Gen M3 incorporates new material technology. This new new tech and manufacturing processes enhance strength, durability, and reliability. These innovations help Magpul exceed rigorous military performance specifications. The magazine is for Colt-spec AR15/M4 platforms but also operational with the HK 416/MR556A1/M27 IAR, British SA-80, FN SCAR MK 16/16S, and others.