My "Oh shit" policy is a trusty AK47. In war games like Call of Duty I tend to gravitate straight to them because the first two options aren't available and the M16/M4/whatever the fuck it's called this week usually sucks donkey dicks with regard to one-shot stopping power. It certainly did in Cod4 and CoD6. I could usually one shot an AI with the AK. Might be realistic, might not be, don't really care, that's just how the game mechanics panned out. At any rate I've always loved AKs. it's reliable, it's reasonably accurate, it can spray and pray with the best of 'em, it's durable, it sounds cool, and I don't care who you are you look badass holding one!