Anarchism is pure nonsense. There is literally no such thing as "no government." In a "state of nature," every government is size 1---you. You are responsible for retaliatory and initiatory force, and every interaction is foreign diplomacy with a gun behind it. From there, things can (and will) evolve so that there are larger governments, but you cannot get "no government."
That is a most accurate observation, but what does it add to the discussion? You have some implicit assumptions about anarchy there... why would there be guns? We aren't all americans you know... Also, I don't understand the negativity, did you notice the sprawl of civilisation around you? That came from anarchy... its proven to work in some sense.
I'm not the OP but it seemed clear to me.
Right now governments conflict with each other using guns (and missiles, and drones, etc), if/when diplomacy fails.
If the law is the law of the individual, then each individual would be obligated to have his own 'defence department' if/when diplomacy fails.