Well, my 3 weeks of food were not aimed at this "End of world as we know it" scenario and original question was not aimed at one. Just at being better prepared than average.

Guns really are also not "get and forget" kind of think. They can help or get you killed.

They might get you killed by mismanaging them (basically you shoot yourself by accident), by making you overconfident and not escaping in time, by making you a target "to get your guns", by making you suspicious (imagine checkpoints in now occupied parts of Ukraine) and getting killed in interrogation.

Guns are not all advantages in real world situation.