We start with a fresh and new ProMag 12 round drum, and tune it to perform perfectly with the Pro Series 5. We use a rotary tool with the precision of a surgeon to ensure proper feed. We also adhere and pin in the BAT feed ramp. When your get your drum, it is ready to run. On the ProMag drums, the last shell acts as the bolt hold open.
ProMag 12 round drum for Pro Series M Semi and Pump Action