Magpul Industries Magazine, PMAG 30 AR/M4 Gen M2 MOE Window, 223 Remington/556NATO, 30 Rounds, Fits AR Rifles, Black MAG570-BLK The PMAG 30 AR/M4 GEN M2 MOE Window is a 30-round 5.56x45 NATO (.223 Remington) AR15/M4 compatible magazine that offers a cost competitive upgrade from the aluminum USGI. It features an impact resistant polymer construction" easy to disassemble design with a flared floorplate for positive magazine extraction" resilient stainless steel spring for corrosion resistance" and an anti-tilt" self-lubricating follower for increased reliability. Not compatible with SA80 and HK416" or similar" platforms.