Specifically engineered for volume target shooters and free state tactical shooters, the ProMag® Ruger® SR9 9mm 50-Round Drum Magazine is an affordable aftermarket tactical magazine, engineered to deliver consistent field service and unwavering reliability in any target-rich environment. This high-capacity drum magazine features a heat-treated steel upper for a precise fit and finish, while the stamped steel feed lips offer a snug, wobble-free fit, and smooth feeding performance.