The story links to this video (which doesn’t have anything to do with the story) but it shows an M136 AT4 (light anti-tank weapon)
http://www.youtube.com/watch?feature=player_embedded&v=hLJxp2wRISs
In fact from what I’m reading the tube is intended to be tossed aside after use.
AT4. Dummy, used for training purposes. Somehow the kid got it, but in no way would that thing ever be able to fire anything. Typical over-reaction by retarded reporters.