Duplication/Infinite Money Glitch
This is a very good way to share loot if you play coop.
First off, go into the trade menu with another player and trade the item you want to duplicate. Now accept the trade and press the Guide button and return to the dashboard so when you quit you don't save. When you return to the game you will still have the gun you all wanted and the person you traded with should also.
You can use the same method but with cash should you choose.
Added by: StEeZy BoY666 Sep 23rd 2012, ID#8671