Airing for one season (1953-4) on the NBC radio network, The Six Shooter was a western series that seemed custom made for its star, Jimmy Stewart. Stewart played Britt Ponset, a drifter with a deadly aim. This was one of the better western series; its penchant for adding some humor seems to foreshadow Maverick, although I don't know of any creative relations. (But, hey, Britt...Brett; just sayin'.)
The link below will take you to all forty episodes. Enjoy.
(Stewart refused to go along with the network, which wanted a cigarette company to sponsor the second season. He felt this would be a betrayal to the children who listened to the show. Knowing it would be almost impossible to replace Stewart, NBC cancelled the series. Jimmy Stewart always was pretty cool.)