The Promag Standard Pro Drma31 Drum S&w Shield 9mm 30rd is a 30-round drum magazine chambered for 9mm. It features DuPont Zytel Polymer construction. It is intended for S&W M&P Shield compatibility.It is a practical option for adding a spare or alternate-capacity magazine to a compatible firearm setup.Caliber: 9mmCapacity: 30 roundsMaterial: DuPont Zytel PolymerFit: S&W M&P Shield