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Brought up with a button held down, and with the analog stick you can select a weapon. I don't think this would fit in the RE franchise. But instead of doing this (real-time by the way) each time you want a weapon, you can choose 3 of them once and they'll be in the memory, and then you can choose to cycle between those 3 with Triangle, or cycle the whole wheel (an option, too).
I just wish the inventory is more versatile than what it was in RE5.