Eat-Man Vol 2

From the VIZ Media edition

Bolt Crank is known as Eat-Man for his ability to eat everything from guns to radios to swords with a chaser of gasoline and then transform the flesh of his arm into the things he's consumed. Not entirely a superhero, fantasy, or science fiction story, Eat-Man features the kind of genre-mixing wackiness found only in Japanese manga.

Source: Anime News Network Encyclopedia