Chuck Connors is said to have fired 12 shots with the rifle in the opening credits.
The character 'Lucas McCain' was ranked #32 in TV Guide's list of the "50 Greatest TV Dads of All Time" (20 June 2004 issue).
In the pilot for the series, by Sam Peckinpah (originally written for "Gunsmoke" (1955) but turned down for that show), Chuck Connors' character was named John McCain, not Lucas McCain, and he didn't have a son. It was producer Arnold Laven's idea to make McCain a widower with a son. Also, McCain was originally supposed to have been a dead shot with a pistol. Laven had the idea to use a customized Winchester rifle as McCain's weapon of choice.