The Amend2 30-round magazine is a sturdy, reliable 5.56x45 NATO (.223 Remington) AR15/M4/M16 magazine made of an advanced polymer material. It is a light, durable, and excellent alternative to the standard M4/M16 USGI aluminum magazine. FEATURES: 30-round magazine. Sturdy, impact resistant polymer with textured grip. Anti-tilt super follower. Heavy duty, non-memory, and non-corrosive stainless steel spring. Made in the U.S.A. Material able to cerakote.