Death Rides a Horse (1967) (repost)

In the Old West a little boy witnesses the murder of his family by gunmen and grows up with plans to track them all down, and kill them.

Director:

 Giulio Petroni

Writer:

 Luciano Vincenzoni (story)

Stars:

 Lee Van Cleef, John Phillip Law, Luigi Pistilli - via IMDB

https://archive.org/details/DeathRidesAHorse