Acid pellet

Acid pellets are small projectiles formed of acid. The Autobot Prowl uses a gun that is capable of firing acid pellets, as well as lasers. Scattershot wields an atomic acid pellet gun, which is also used by Computron. A shot from Scattershot or Computron will burn you. And irradiate you.

From Teletraan I: The Transformers Wiki, a Wikia wiki.