Magpul MAG1033BLK PMAG GL9 50rd Drum 9mm Luger Compatible w/Glock Black PolymerMagpul 9x19mm Parabellum, 50 round drum magazine optimized for double stack 9mm GLOCK handguns. Providing 50 round capacity, the unique drum configuration keeps the height of the magazine manageable, allowing for easier storage. For easy loading, it includes a ratcheting loading lever that removes tension from the internal spring.