Sunset in the West plot
"Six-Gun Trouble!... the border blazes with bullet-fast action as Roy and the gang track down a band of international gun-runners!"
In the border area, trains are robbed and used to transport weapons. Roy Rogers gets involved when the train that was supposed to transport his cattle passes him without stopping. Rogers decides to lend a hand to the sheriff and arrests a suspect. This one manages to escape after the sheriff identifies him and keeps Rogers as his prisoner. Rogers is taken to the leader of the gang while the bandits prepare for another train hijacking.