I am finding the Vargen to again be the most nasty, in your face sounding weapon. With HCM, HH, SS and Laser attachment it is an awesome way to clear a room as long as you don't mind receiving the "Blind Fire" accolade. I've been forcing myself shoot only from the hip and have found, like I'm sure many of you are well aware, that the laser pointer is a nice way to aim for heads.
Now, I can see why a lot of 56s seem to dance back and forth whilst they eliminate me. I've been relying too much on ADS. Fun to put that laser on an opponent and run circles around them.