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The Medi Gun, Quick-Fix and Vaccinator rank up based on ÜberCharges deployed. The Medi Gun, Quick-Fix, Vaccinator and Kritzkrieg track ÜberCharges and kill assists.
The Southern Hospitality only tracks standard melee kills.
The Wrench, Gunslinger, and Jag track Sentry Gun kills, whether Wrangled or not, and standard melee kills, and rank up based on Sentry Gun kills. Mad Milk and Jarate track and rank up based on the number of coated enemies, or "Sodden Victims". The following Strange items do not track kills, instead:.