Rushing with the the Swat is pretty easy and there's nothing more awesome than taking out a bunch of campers with it.
You can do that with anything but the the SMGs would stop you cold. You could play more offensively but I wouldn't rush with most ARs. In fact, I se the SWAT as one of the worst ARs to run and gun with and think you should stick to its true strength, abusing its high medium-range potential. Sam goes for the FAL.