Recently, Just Jared got a hold of a more extensive batch of stills of the mysterious hero while The Dark Tower production filmed exterior shots.
Since the mythos of The Dark Tower series approximate a medieval quest crossed with a post-apocalyptic western, Deschain’s pistols equate to his sword in the overall theme.
It’s possible these characters are being cast in secret or won’t show up until later in the film series (assuming The Dark Tower is successful).
Stephen King’s horror western classic, The Dark Tower, languished for nearly a decade in development before receiving the green light to make its way to the big screen.