A favorite among civilian and professional volume target shooters alike, the ProMag® Springfield Armory® XD .40 S&W 50-Round Drum Magazine is a high-capacity drum magazine, engineered to deliver smooth, factory-like performance and superior stopping power in any target-rich environment. This American-made drum mag features a durable, steel-lined DuPont™ Zytel® polymer drum for lightweight reliability and lasting corrosion resistance, while the steel upper ensures a factory-like fit for optimal performance.