Glock 19 15 round Generation 4 factory magazine G19 Glock-MF19015. The magazine will fit the following models: G19 & G26 (G26 as an extend magazine). The Glock 19 magazine is compatiable in the ZEV Technologies OZ9c. 

DOES NOT FIT THE GLOCK 19X. THE GLOCK 19X TAKES GLOCK 17 MAGAZINES.

Check out the XGrip Adapter if you want to use them as extend magazine. The XGrip Adapter will fill the space making a grip instead of just having the magazine stick out. They have a stiff metal tube encased in the proven Glock high-tech polymer. This resists deformation – even when dropped from great height or exposed to extreme environment conditions.