Gibbed's Save Editor Tutorial ( Paste Codes )

THESE MONKEYS ARE REady to kill terramorphus now thx

Hey, I have a question about modding the guns. You see, I can make them, and they appear in my bank exactly how I make them. I take them out of my bank, use them for a little while, and they act just fine. Then, I put them back into my bank, leave the bank menu, then re-enter just a few seconds later, and all of the extra stats are gone!
Any extra barrels I put on there no longer have any affect on the gun- it's basically returned to its base form. This doesn't happen with guns whose codes I get from the Internet (like this place, for example), or with other guns. It really only happen with guns I add the Orphan Maker or Jolly Roger barrel to. However, it doesn't affect other people's guns who have the same modded barrels on them.
They work perfectly when I take them out of the bank the first time, I put them back in, exit the bank menu, re-enter the bank menu, the stats are gone, take the weapon out, it acts like it only has its own barrel on it.
What is it that I'm doing wrong? How can I prevent my guns from losing their added barrels every time I put them back into my bank?