Forum:Disappearing weapons after trade?

I had gotten a really nice level 22 revolver and level 22 repeater on my level 15 Soldier (whom I use only for singleplayer.) I wanted to transfer the items to a friend of mine, one for him and one for my multiplayer Hunter. We went into a multiplayer game (PC/Gamespy) and I gave him the weapons, he picked them up and we exited the game. We started another game, this time with me using my Hunter, only to find...The two weapons had disappeared from his inventory.

Has anyone had problems specifically like this? It annoys me because the weapons were worth quite a bit of money.