Magpul Industries Magazine, PMAG D-50 GL9-PCC, 9MM, 50 Round Drum, Fits Glock Pattern Pistol Caliber Carbines, Black, Does Not Fit Glock OEM Pistols MAG1137-BLK Lightweight but incredibly strong" the PMAG D-50 is a highly-reliable" 9x19mm Parabellum" 50-round drum magazine. Robust stainless-steel internals withstand corrosion and long-term loaded storage with no loss of function. Simple disassembly for cleaning and easy re-assembly.