I think it would be an awesome idea to have dual MP5s with no reload. Kind of like morpheous on the super hero mod.
Advantages: Keep shooting until your target is dead
Disadvantages: Hits are weak if shooting from long ranged.
(Maybe the no reload is kind of stupid, but dual MP5s with some kind of special ability with it would be cool.)
Edit: Also, making it slightly stronger might be a good idea too, like double the damage since there is double the guns.