Get to Know All Your Guns

If you play Modern Warfare 2 long enough then you will surely end up in all sorts of sticky situations. I cannot tell you how many times I've found a random weapon on the ground that saved my life, because I was out of ammo. That is why I cannot stress enough the importance of knowing and becoming familiar with ALL of your guns. You never know what the Call of Duty Gods will provide you with so you should be able to pull off a kill with any weapon. If your out of ammo sure you can go search a pile of bodies for a weapon of choice, but this will most likely result in a quick death. The M16A4, FAMAS, and FAL are good examples of weapons that not everyone can use. If your not good at using a burst fire or single shot weapon, then you need to force yourself to use them. Someday you will end up in a corner surrounded by enemies, with nothing but a second hand M16 so if you don't know how to use it properly you will have an embarrassing death. The same goes for Sub machine guns, Sniper Rifles, and light machine guns. Riot shields are sort of an exception since almost anyone can use them. Using a variety of weapons will not only get you more experience, but increase your overall skill as a warrior of death.