The way I understand Missouri gun laws is that local govts. can't be any stricter than state law. Can't remember the term, though. Open carry is legal in all of Missouri, but they can snag you on other laws. Public disturbance type of laws and of course brandishing a deadly weapon. I remember a guy here in Springfield that had a pawn shop and flea market over on Commercial St. He wore a side arm while at work, which is practiced by the majority of pawn shops I visit. He would have to go out in front of his store to run the bums and panhandlers off several times a day. His handgun was always holstered and never drawn, he was just wearing it. He was picked by the cops and held for "mental evaluation" the max amount of time allowed by law without an arrest(24 hrs?). Don't recall what happened in that case though.