Xevyr
7
That is most likely due to the fact that they decided… after several years… to suddenly start using separate heavy damage values for ALL weapons… 
(Up to now for most weapons light and heavy damage was the same and the heavy combos just used a higher multiplier on it - instead of balancing from there, they individually changed the heavy damage on stuff - also causing a bit of a nightmare for modders… wiki editors… and all that good stuff… )
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