Has there yet been any Word of God on firearms in the Methods of Rationality? I know that the other Word of God has the famous quote, "In a fight between a Muggle with a shotgun and a wizard with a wand, the Muggle will win." I'm curious if this sort of thing still holds for MoR.

That's not how I remember the quote at all. What I remember was more along the lines of "a pure-blood fanatic versus a competent Muggle with a gun would lose," with italics added to indicate which part I'm unsure of the wording on. Which, of course, has completely different implications.

I searched for the original quotation for what I remembered and for the quote that you posted. I couldn't find mine, irritatingly enough, but I couldn't find an original quotation of yours, either. Do you have it?