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For modern warfare 3 it is by far kill comfirmed while using a sub machine gun and running the specialist kill streaks.
I've heard this as well. But you need to be able to consistently achieve the 8 streak so you get the all specialist bonus. I remember from MW2 if you played Demo with a full party or at least 4, and you can control the game, there is a formula you can use
to get a large match bonus. You win the first round, throw the second, and then win in overtime. I'm not talking spawn trapping, just controlling the game for the max XP.