Well they do make constant run for supplies. I'm assuming that includes ammo. Must be ammo shops throughout the area no? But yea, when the first found the prison didn't they say they had a decent ammo supply? Plus, Darryl has to be getting arrows from somewhere OR does he make them now that I think about it? Out of wood or something?
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK
Plus, Darryl has to be getting arrows from somewhere OR does he make them now that I think about it? Out of wood or something? 
