Westworld was written and directed by Michael Crichton who also penned Jurassic Park. If you think about the theme - a resort area goes amok and trapped tourists have to resourcefully fight back - Mike recycled his own idea.
When Brynner was approached to play the Gunslinger, Crichton suggested playing him like Jack Palance in Shane, but Brynner suggested Chris from Magnificent Seven to Crichton's great pleasure. The movie was shot on a miniscule budget and when the Gunslinger is stalking down the miles of corridors, you can piece together that it's the same set over and over again.
Not a bad little movie but I don't think it, or Futureworld, qualify as westerns. Note that veteran stuntman Terry Wilson plays the doomed sheriff.
For shear torture try sitting through Silent Tongue with River Phoenix.
For laughs try Terror in a Texas Town which ends in a stand off between a gunhand and a harpooneer.
We deal in lead, friend.