This is the Magpul PMAG GEN M3 AR-15 40-round magazine, chambered in .223/5.56NATO.
Named the PMAG 40, this extended AR-15 magazine features a next-generation polymer construction. Magpul’s GEN M3 advancements bring even more reliability and strength to their magazine line. These advancements include anti-tilt lubricating follower, ribbed texture grip, dot matrix, and pop-off dust-covers. What’s not to love?
If you’re looking for an extended AR-15 magazine, but not quite a drum magazine, this 40 round PMAG by Magpul is an excellent choice.
Pick up a Magpul PMAG 40 mag and try it out yourself!