The Rifleman - watch online: streaming, buy or rent
Currently you are able to watch "The Rifleman" streaming on Amazon Prime Video, fuboTV, Peacock Premium, Amazon Prime Video with Ads, Peacock Premium Plus, Philo, Pure Flix, Great American Pure Flix Amazon Channel or for free with ads on The Roku Channel, Fandango at Home Free, Pluto TV, Amazon Prime Video Free with Ads, Xumo Play.
You can also stream the title for free on Plex, Plex Player, Plex Channel, Fawesome.