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Get all of your guns to 149/150 kills
go into a match and use each gun from class 1-5
aquire the 5000 XP
flick the switch or unplug your ethernet cable from your PS3
it will give you various error message, most likely "Network Connection Lost" or "You Must Be Signed In With A Valid PS3 Account" (or something)
Plug it back in or flick the switch back and you will have received the 5000 XP
Goto Barracks > Challenges and notice your guns are still at 149/150

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