Mustafar rifle

The Mustafar rifle was a blaster rifle used by the Mustafarians of Mustafar.

The rifle consisted of little more than a single long barrel that was an amalgamation of a number of pipes and long metal parts. Its only distinct feature, in fact, was a carrying handle that protruded from the side of the weapon.

Because of the presence of lava and volcanic ash in Mustafar's air, these rifles were usually marred with rust and sooty or scorched discoloration.

Source

 * Revenge of the Sith: The Visual Dictionary