Damage increasing

Sniper: +2 +3 +6 +15 +30 +40 +50 +75 +100
Special: +3 +4 +8 +17 +34 +44 +54 +81 + 106
Heavy: +4 +5 +10 +19 +38 +48 +58 +87 +112
Back up: +5 +6 +12 +21 +42 +52 +93 +118 + 5
Primary: +6 +7 +14 +23 +46 +56 +99 +124 +6
Melee: +7 +8 +16 +25 +50 +60 +70 +105 + 130
Snipers are born strongest, that is why they have the least upgrades.