Gunsmith Steve Farrell (Randolph Scott) arrives in the town of Bonanza Flats to demonstrate the ultimate advancement in frontier weaponry: the new, rapid-firing Colt.45 pistol. But ruthless outlaw Brett Amrock (Zachary Scott) steals a pair of the revolvers & unleashes a brutal wave of terror across the territory. Wrongfully accused of aiding the bandits, Farrell must break away from the law, track down the vicious gang, and reclaim the deadly weapons before the West is completely overrun.