Here is a list of 5 cool coil guns, either one would be fun to try out. Remember that coil guns can be dangerous, if you build one and shoot out your eye don’t say you weren’t warned. 5. The Mk II Coil RIfle This is the second gun that Nicholas Howard has built. “This is my second coil rifle, it has a firing energy of about 5 joules and it charges in about 10 seconds. the power source is the 12V 3