Ispiration is comic crossover of Shadowman and Saint of Killer from the Preacher.
This is a cleaver blade shaped like a walker colt which has no bullets or firepower on daylight, but still works well as a melee weapon.
Behind the veil of darkness it becomes a shadow gun busting and ripping daemons of all kind.
"The gun would not misfire, nor would its hammer fall on empty chambers. No shot it fired would miss its mark. No wound it gave would be anything but fatal."