I doubt you can get rid of the dark spot, but it looks like there is some real "character" hiding under the factory-applied stain and lacquer. Stripping with something like Circa 1850, staining (if desired), and applying an oil finish will really make it stand out.
CZ probably uses the finish they do on stocks because it is quick to apply and gives them a more uniform appearance. That said, to me, part of the appeal of wood stocks is that no two pieces are identical.
CZ probably uses the finish they do on stocks because it is quick to apply and gives them a more uniform appearance. That said, to me, part of the appeal of wood stocks is that no two pieces are identical.