One Piece Chapter 47, page 14: Pirate Fleet Admiral "Don Krieg"

The cooks are blown backward, defeated and bleeding. Luffy and Sanji stare in disbelief, exclaiming, "Guns...!?" and "From all over his body...!" Gin covers his face in despair. Don Krieg laughs triumphantly, boasting, "You damn worms think you can defy me!? I'm the strongest! This body of steel, tougher than anyone else's! This steel arm, more powerful than that of anyone!"