Legendary weapons question

[RonArsenal]

If I join another players world, walk into his weapon shop and steal any weapons that I didn't have in my world, do those weapons carry back over when I re-enter my own world? Would that count towards the achievment?

[Ragnarok1986]

If you mean buy not steal it's okay the items will restock. But they will be the same items what you took.

[XBL Unreal]

Just make sure what ever weapons you get in another player's world, that you go back to the sanctuary and save. Or they won't count towards your achievement.