The Fastest Gun Alive (1956)

Whenever it becomes known how good he is with guns, ex-gunman George and his wife Dora have to flee the town, in fear of all the gunmen who might want to challenge him. Unfortunately he again spills his secret when he's drunk. All citizens swear to keep his secret and him to give up his guns forever -- but a boy tells the story to a gang of wanted criminals. Their leader threatens to burn down the whole town, if he doesn't duel him.