I had one that took G19 mags. I don't think you'd be wrong to wait for a G19 gripped version, or to cut a G17 version down. I just cut my actual G17 to take G19 mags. Cutting it shorter lets you use a wider variety of mags instead of limiting you to longer mags. Then you can use 15rd, 17rd, or 33 rd mags.
Understand that if you do cut the grip, you may void warranties.