I think it would be a good idea to include some sort of number to express the weapon statistic being displayed in the bar graph. Currently, if I want to compare two different weapons, I need to either guesstimate based off the graphs or hold a ruler (or whatever) up against my TV.
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Equip one weapon you want to compare and then hold down R2 while looking at the other one. Red in the bar graph means it's worse and green means it's better.