The Black Rain Ordnance 30 round magazine is a sturdy, reliable 5.5645 NATO (.223 Remington) AR15/M4/M16 magazine made of advance polymer material. It is a light, durable and excellent alternative to the standard M4/M16 USGI aluminum magazine. FEATURES: Sturdy Impact resistance polymer with textured grip. Anti-tilt super follower. Heavy duty, non-memory, and non-corrosive stainless steel spring. Made in the U.S.A. Produced by Amend2 Magazines