Question: bltps how to dupe items?
Answer: 1.) You must be online with a friend (a real friend is likely required or if you have two accounts that can log into the game at once that will also work. ... 
2.) Once logged in make sure you equip the gun you want to dupe.
3.) Turn off and then turn on the Badass Rank to auto-save your game.
4.) ... 
5.) ... 
6.) ... 
7.)