Take it out before it's out of ammo for more goodies! (pastebin.com)
You're able not only shoot, but throw your weapons in any direction you want, which is helpful with knives when you're out of ammo for your guns. (slickstermagazine.com)
With ammo at a premium, this system, much like the single player addition, will save your hide hundreds of times over. (counterattackgames.com)