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Here's A new(ish) way to Boost with A Riot Shield! ( Originally From Mw2! )
Step One: Get a Friend to be in your party.
Step Two: Make Sure you have these two classes ready. A class with a MG and a class with a riot shield.
Step Three: Go into a Hardcore SnD ( Advanced Game Modes - Hardcore S&

)Game and one person shoots the others riot shield. ( Use Only One MG Mag so it isn't Toooo Obvious )
Step Four: Get Loads Of Exp!!
NOTE: You Can use a second controller to get even more EXP.
NOTE 2: If you happen to see any sentry guns, stand infront of them as they also count toward your EXP
NOTE 3: If you want a high level in split screen for some reason, Just use this method.
Feel Free to Quote me and give me more ideas on what to add to this.
Rep Me If you guys wanna
Credits To:
rockym56 for the Sentry idea
Sweaty Midgetz For the Second Controller idea.