Hold On
According to the notes for the show, The Rifleman was set in the 1870s and 1880s. However, McCain used a modified Winchester Model 1892 that came with a big ring lever! That feature let him pull off the spinning technique he used. Of course, it would not have existed yet if the show was real.
Tweaking the Show
Sam Peckinpah first wrote the pilot episode of The Rifleman for Western Gunsmoke, but it got rejected. The writer-director made some changes to the script by changing the name of the lead character from John McCain to Lucas McCain and added his son to the story. How awesome is that?!