Homeland Security may not like it, but I believe in the right to bear arms. So if you want to learn how to make your own Rebel fleet trooper blaster rifle, I've got just the resource you're looking for. As the link mentions,
"You may buy blue plastic dart gun by Hasbro, or a great looking but absolutely non-functional $400 model from Master Replicas." The advantage here is that this particular set of instructions calls for the inclusion of light and sound effects. Again, you could buy a plastic equivalent of this on the cheap. But if you're looking for something to do over the weekend, or if you just want to be the first on your block to claim the achievement, I suggest you click through and check it out.
Link:
http://homerecipesnote.blogspot.com/2008/02/how-to-make-star-wars-rebel-trooper.html