You made the rookie mistake of calling a magazine a clip. From now on please refer to them as magazines. But anyway you certainly can use G19 and G17 magazines. They even make sleeves to make them look and feel better but are not nesessary for them to work. You can also use the G18 magazines which hold 33 rounds. Glock factory are best and I liked the Magpul magazines also but I would stay away from cheap Korean ones. They are hit and miss.