From Magpul: "The PMAG is a 30-round 5.56x45 NATO (.223 Remington) AR15/M16 compatible magazine. It features an advanced impact resistant polymer construction and an easy to disassemble design with a flared floorplate for positive magazine extraction from pouches. The PMAG 30 utilizes a resilient stainless steel spring for corrosion resistance and a anti-tilt, self-lubricating follower for increased reliability.
This current revision has been updated with a new body ribbing design which allows for better compatibility with aftermarket mag couplers, a new follower which provides even smoother loading with military stripper clips, and the Impact/Dust Cover can now be snapped onto the floorplate when not in use to prevent possible loss."
Made in the USA.