Hey, I made a rail gun that is 3" long with a disposible camera's flash charger. The one problem i had was that i couldnt get the spark to jump across the two rails. So i took a piece of metal with plastic on the outside and touched the bolts on opposite sides and got a large spark but not shock. Is there something i didnt do right? This is the sight i used www.geocities.com.nyud.net:8090/physicsthings/microrailgu.htm I probably should mention that i did not have the negative wires separated like the guy said because i thought that was stupid and i would just wait untill tomorrow to get a switch. Also this might be helpful the capicitor im using on the charging mechanism is 100uF and 330wv.