I just watched a video about a new rifle called the Tavor. It pulls the
mechanism back to the stock to form a very short weapon with a barrel
that runs the full lenght of the gun. In that it is similar to the
Styer. It looks very futuristic and I'm sure that someone will try to
make something similar for a Lazer Tag game soon. Here is the link if
you are interested in watching it in action:

http://video.google.co.uk/videoplay?docid=303748147167294168