Star Wars Episode 4: A New Hope - Stormtroopers Fire Blanks
If you look closely when the Stormtrooperss lasers are fired, you can see the empty cases being ejected. This is because the lasers are actually 9mm Sub-Machine Guns used by the British Army with the stock folded and a cut-down magazine. I suppose Lucus chose this so the actors would look realistic when shooting.
The Videos for 4 to 6
on 10-06-2000 and