good classes

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I use lots of weapons in call of duty modern warfare2 but I dont know wich guns are good? I need a list of good setups including perks secondary weapons equipment and attachments barrete 50.cal sniper rifle ump 45 machine gun m4a1 assualt rifle tar 21 assualt rifle fal assualt rifle (not modded) a good shotgun class I really like to screw around in this game and i like using shotguns m21 ebr sniper rifle please post and thank you for reading