the only need I have for a firearm is to euthanize cattle but I can always borrow one from a neighbour, all my neighbours got guns.
I think bullets will be good for trade if currency becomes worthless but most people have no real use for guns so I think that's probably the last thing you need to worry about.
if you don't know how to grow food and make water safe to drink you're going to be totally reliant on other people's kindness.
medicine will be a commodity, especially pain relief and drugs or addiction.
if shit hits the fan, the first people to die are going to be the opportunists who think they can use guns to intimate.
because what a lot of people don't understand is that the law doesn't prevent crime, they prevent reaction.
the only reason shopkeepers don't shoot armed robbers is because of the law.
if someone threatened me with a gun right now it's the state sanctioned violence and kidnapping and being kept in a cage for 25 years that would make me think twice before reaching for their gun and turning it back on them.