Umarex Gas Blowback Glock Magazines - make sure you pick the model that goes with your gun. Below is a compatibility chart to help!
Glock 19X (20rds.) - Compatible with Glock 19X & Glock 17
Glock 19 (19rds.) - Compatible with Glock 19
Glock 18C (50rds.) - Compatible with ALL VFC Style Glocks