S-R6 was an assassin droid during the time of the Galactic Civil War. S-R6 was created from the skeleton of an ASP-series labor droid, allowing it to work undercover while avoiding being noticed as an assassin. During the Galactic Civil War was sent to kill Imperial Governor Merno Blask on the planet Trevura. When it was learned that Governor Blask was importing experimental blasters from Coruscant, S-R6 was interested because of his obsession with guns as well as to determine any potential problems with the assassination attempt. S-R6 managed to obtain some of the new Imperial blasters from a group of freelance agents, who helped him avoid an Imperial ambush and carry out his mission.