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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I agree that, in the beta, hand cannons were pretty much outclassed by scout rifles across the board. But that doesn't mean it wasn't a blast to use. :)