The ProMag AR-15 Magazine a steel replacement magazine for your AR-15 rifle.This 5 round steel magazine is for .223 Remington/5.56 NATO and comes in a black finish. Each magazine is expertly machined for exceptional quality and is guaranteed to feed and function for every shot.ProMag magazines include a lifetime guarantee if you ever have a problem with their magazines; simply return them to ProMag for replacement.FeaturesManufacturer Number: COL 19ProMag AR-15 .223/5.56 Magazine 5 Rounds Steel BlackCaliber: .223 Remington / 5.56 NATOCapacity: Five RoundsBody Material: Heat Treated Blued SteelSpring Material: Heat Treated Chrome-silicon WireFollower Material: DuPont Zytel PolymerFollower Color: GreenBase-plate Molded from DuPont Zytel PolymerFinish: BlackFitsAR-15 Rifles .223 Remington/5.56 NATO PlatformYear after year ProMag has increasingly become one of the leading manufacturers of firearms magazines in the world.Gun enthusiasts and law enforcement personnel have agreed be it for recreational "plinking" competition shooting or law enforcement Promag is the source you can count on.