What are your favorite guns in a video game or real life and why?

I don't play video games, but I own a Barrett and an AXR (which is a US made copy of the AUG). Both are good rifles, but they have widely different purposes. I also own AKs, ARs (most of which I custom built to suit me) , shotguns and pistols. My favorite is the one I can get my hands on when I need it.