Forum:How do modded guns get to the 360?

Here's the thing, on the xbox 360 you can dupe guns by signing out to the dashboard after dropping your guns and so long as you're not the one hosting the match, then anyone can pick up your dropped guns and keep them. now I have a purple shredder shredder assault rifle with absurd stats that I've had since DLC3. It was duped for me. They said that they got it from a Crawmerax drop, but in the "Is this modded?" thread on this forum it says that a shredder anything other than a shotgun isn't legit.

so how would you mod anything on the xbox? can that even be done? I mean I haven't lost it with any of the updates and while it's clearly OPed, I don't see how they could introduce modded weapons into the game on a console. Is there any chance that the randomizer engine for the weapons f-ed up and made it?