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I know i didn't find the XP riotsheild xp hack i have found the best method.
1st. Have classes, Riotsheild, AA-12 Shotgun, Tactical insertion and slight of hand
Then go into a cage with someone, Lay down tac insertion both of you, one shoots there shield, The other returns at the riot shield then stab one another and put tactical insertion down again.
Once you have done this go to 19 only no 20kills so you split match bonus and then your get minimum 17,000xp in 10minutes