Biggest record on kills was 200 when the server was 20/24 hours with 28 players in "the days". People who have achieved similar scores were Popay, Soge, Renegade, Russu and Silime. Of course in the boundaries of the rules back then. And what is seemingly really werid about it, it was done when the solo commanding ct challenge was running.
Biggest record of kills from Rebellion was in the first Jailbreak tournament (around 40) reached by Kostik, Silver Shooter, Moonlight, Dexona, Delusion Cookies and Ement.