Magpul Industries PMAG, D-50, Drum, 9MM, 50 Rounds, Fits CZ Scorpion EVO 3, Black MAG1035-BLK Lightweight but incredibly strong" Magpul's PMAG D-50 EV9 is a highly-reliable" 9x19mm Parabellum" 50-round drum magazine for large-format pistols and pistol caliber carbines that feed from CZ Scorpion EVO 3-pattern magazines. The D-50 EV9 features a ratcheting loading lever that removes tension from the internal spring. To keep track of your available firepower" they've included a rounds-remaining rear window and a high-visibility follower tip.