Just because you don't know how to use them doesn't mean the stats should be bumped up. If they are it'll become OP. Learn to use them and you won't have a problem.
If they get a buff the players who are already good with them will be completely unstoppable.
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The question that I have is, are the higher/rarer HCs going to have variety in their rates of fire? I like the hand cannon I only hate that it's a 6 shot revolver. Maybe there are other versions.