The Last Challenge (1967)

Hotshot gunfighter Lot McGuire (Chad Everett) intends to make a name for himself by out-duelling legendary bandit-turned-lawman Marshal Dan Blaine (Glenn Ford). Before any bullets fly, however, Lot and his intended enemy strike up an unlikely friendship, and Blaine tries to convince the youngster to call off the shootout. Unfortunately, Lot can't be talked out of his quest for glory and so he guns down a few hostile locals, leaving Blaine no choice but to finally accept the offer for a showdown.