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 magazinesCapacity: 30rdModel: MagazineMaterial: PolymerCapacity: 30