Micro Railgun - Do it Yourself

hackaday.com — It is really easy to put together. The barrel is constructed from two 3” long pieces of aluminum weld bar with heavy duty Lucite sandwiched in between. The projectile is a tiny piece of aluminum foil. There is also an in-depth description on here: http://www.geocities.com.nyud.net:8090/physicsthings/ microrailgu.htm