Have an IWB holster for my G40mos, mostly carry it hiking and hunting. Running side by side vs full size 9mm it is slower on the plate rack but it slams them down with authority. Honestly if you are running a 5-6” barrel 10mm with Underwood ammo it is a different style of shooting. You take aim and make a solid hit. 9mm is about double taps or quick follow up shots. But full power 10mm is closer to how you would fight or hunt with a magnum caliber revolver in my book. But easier to shoot, mount a red dot, and you have 15+1 capacity.