I would use it with the shotgun if I was good at using the shotgun. Aren't you good at the shotgun? Tag ... run up close ... shotgun blasts are heard. When I rip and kll at will. Man of the hour. I devour ... sorry about the LL
The shotgun is a slow weapon at times. I would use either the carbonizer(since I have imp. energy), SCAR, or USP.
That cheered me up. I just needed a good rest as I was staying up until 11 pm. If I stay up too late, I don't get tired, but I become a joker and I screw around with the game a lot (for example, I used the AEGIS).
I heard somewhere on C2 wiki that energy upgrades don't affect the carby in online multiplayer due to problems in the development or something.