Duplicating Weapons
You need to be in a online game and need two people first run past the save point after it saves you need to get at leats 80 feet away from it so it can't activate second have the person drop the gun then boot him then pick it up and invite him back to the game and then you both should have the gun now (this works after all patches)
More tricks, tips and cheats for this game are right here - Borderlands cheats
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