I think some dude already came up with the idea of Gunman, a gun-themed superhero in a gun costume, operating out of the Guncave, driving the Gunmobile and incapacitating villains with gun-shaped boomerangs. (He does shoot sharks instead of using a special repellent, though.)
It may or may not have been Lore Sjoberg
It may or may not have been Lore Sjoberg