My Kind of Town: After Deputy Beagle is rescued from the escaped convicts, Primm Slim can be reprogrammed through a dialogue option (Science 30) or with the application of 3 fission batteries and 4 conductors to become the new Sheriff of Primm. If he becomes sheriff, Beagle will resign, stating that Slim is guided too much by cold logic and the letter of the law.
A Pair of Dead Desperados, I: Activate the gun case at the Vikki and Vance Casino. A message will pop up, saying that it is empty. Talk to Primm Slim and convince him that the contents of the case are missing. Volunteer to find the contents and return it. Retrieving the gun yields no rewards unless one decides to keep Vance's 9mm submachine gun for themselves which similarly holds no penalties from Primm Slim.
Despite being durable, Slim lacks an attack mode, which leaves him unable to retaliate. However, attacking him will cause the rest of the Primm citizens to become hostile.
Once made sheriff, he will make one patrol around Primm and then stand near the Bison Steve Hotel for the rest of the game, to the right of the building, underneath the coaster tracks by a garbage bin.
After taking 万斯的九毫米冲锋枪, he will say "Always good to see you, pardner! Anything I can help you with?", but he won't initiate conversation. If this occurs before a sheriff is chosen by the player, it may remove Primm Slim as a candidate.