I have a new 44, like it a lot, it is a great training tool. I also have a Glock 17, actually the 44 is the same basic size as a Model 19. Glock Models are confusing.
My bad, the 44 is the same size as the 19; you are correct on that, Nomosendero.
Glock did 10 round mags for reliability as a 22lr is prone to jamming in high cap mags. I doubt Glock will produce a higher cap mag but maybe someone else will.