The Black Rain Ordnance 30 round magazine is a sturdy, reliable 5.56A-45 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