The Glock 19 was a standard double stack 15 round magazine. The Glock 17 is a standard double stack 17 round magazine. As long as you don't mind a 1/2" longer magazine below the grip you'll be fine. Just understand Glock 19 magazines WILL NOT seat in either a Glock 17 Sub2K or handgun. They will be too short.Thanks. Just wasn't sure if they come that way, or somebody switched it out. I take it Glock 17 mags, (original) will also fit the '19' model just fine, is that correct?