The next-generation PMAG 30 GEN M3 Window is a 30-round polymer magazine for AR15/M4 compatible weapons chambered in  5.56×45 NATO (.223 Remington) and includes windows for rapid visual identification of rounds remaining. Along with an expanded feature set and compatibility, the GEN M3 Window incorporates new material technology and manufacturing processes for enhanced strength, durability, and reliability that exceed rigorous military performance specifications.