Peter H Wilson had an interesting point in his 30 years war book that it's not just the appearance of firearms (musketeers in Spanish terzios fired in their own time), you also had to have a philosophical change to allow seeing a human as a cog in a larger machine; it's fundamentally an Early Modern concept rather than a renaissance one. And so you first see volley fire among the Italian condottieri and the Low Countries' militias, where you were simultaneously seeing the start of mercantile economies based on transactions between individuals.