Hey,
Correct me if I'm wrong here. I just read the new intel about the weapons, namely the SMG and Magnum. Specificly at the Magnum's information, it says there are different variants of the weapons: i.e. next to the 'standard' version there is the "Officer's Model" which could imply that at the game, when you're of a certain level, that specific weapon will get a somewhat tiny upgrade, thus getting stronger.
I'm probably wrong, but it would be really cool to customize some weapons to some degree.
p.s.: Info can be found here
[Edited on 06.04.2009 5:51 AM PDT]