If you are going to carry your G23 with a 357 SIG barrel, I would stick with the Glock factory G32 barrel for complete reliabiltiy. I switch mine out, but I stick with the factory barrels.Pretty sweet though that I can have another gun & caliber with just swapping the barrel. Now just have to decide if I want a stock barrel or some bling with a Lone Wolf Barrel
the .357 sig is a necked down .40 cartridge, so you don't need g23 magazines, or g32 magazines if you're going from .40 to .357 sig. The .40 and .357 sig glocks are basically the exact same guns just with different barrels and engraving on the slide/magazines. Same ejectors, magazines, slides, extractors.