This is another Budd Boetticher movie, from 1957, with Randolph Scott playing a bit against type and a young-looking Noah Beery, Jr. (Something to Get Hung About). Vaughn Taylor (the first desk clerk in Return to Devil's Hole and the stableman in The Day They Hanged Kid Curry) plays Mr. Baldwin, the barber.
Scott is out for vengeance and Beery is his sidekick; they're up against a man who seems to have taken over the town... Decision at Sundown is a fast-paced movie and only about 90 minutes long. The commentary by Taylor Hackford is also interesting.