Al Capone's Baseball Bat is Al Capone's primary weapon in place of firing ectoplasmic bullets from his fingertips. It resembles a steel baseball bat but has the power to block energy blasts, even Proton Streams, and emit blasts of its own when swung.
In the final battle against the Ghostbusters, Al Capone was able to deflect their Proton Streams with the baseball bat. Winston Zeddemore set his Proton Pack to automatic self-destruct and flew Ecto-2 right into the bat's path. Winston's plan succeeded and the baseball disintegrated shortly after impact. Now vulnerable, Capone was easily confined and trapped.