Impact is your weapons base damage in relation to guns of the same type (sniper to sniper, ar to ar, etc).
Where are you getting the 15 from tho?
English
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Weapons start dealing maximum damage at level 20/300 Attack. 300/20=15 Theorising and testing basically.
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Lol Derp on me. I see what you are saying, fairly obvious but I overlooked what you meant at first.