Description The Magpul PMAG 30 GenM3 is a 30-round 5.56mm NATO (.223 Remington) polymer magazine for AR-15/M4 compatible weapons that will work flawlessly every time no matter what conditions you find yourself in. Along with an expanded feature set and compatibility, the GenM3 magazine incorporates material technology and manufacturing processes for enhanced strength, durability and reliability to exceed rigorous military performance specifications. A redesigned bolt catch notch in the rear of the magazine provides increased bolt catch clearance, while an over-travel stop on the spine helps ensure the magazine will not over-insert on compatible weapons.