Professor Volokh has some thoughts:

I want to claim that this echo of Weber (who said “Today … we have to say that a state is a human community that (successfully) claims the monopoly of the legitimate use of physical force within a given territory”) is utterly inapt in gun control debates, at least such debates in a Western country.

To begin with, note that, read literally, my friend’s proposal is not “old-fashioned.” It’s not new-fashioned. It has never been the fashion in any jurisdiction in America.