The PMAG 30 ARM4 GEN M2 MOE Window is a 30round 5.56x45 NATO .223 Remington AR15M4 compatible magazine. The PMAG 30 is optimized for use with Coltspec AR15M4 firearms. It is not compatible with SA80 and HK416 or similar platforms. It features an antiglare translucent Maglevel window on both sides along with a painted indicator on the spring allows for easy determination of rounds remaining from 1 to 30 anti tilt self lubricating follower and constantcurve internal geometry for smooth feeding. Made in the USA."/\