“Six-Gun Caballero” by L. Ron Hubbard
Publication date: March 1938
Original publication: Western Story Magazine
Story description: Michael Obañon is crafty, extremely confident and very cool under fire—all traits needed to thwart a band of renegades who are about to stealing his inheritance.
Currently available as part of the Stories from the Golden Age series, in the book Six-Gun Caballero.