What’s better than a railgun? Maybe a custom-made railgun robot with a scope for mobility and accuracy. This particular railgun tank (35,000 Joules) by Ziggy Zee was built using a RoboteX robot.
According to the developer, there are 70 x 6000 microfarad capacitor that can be driven to 410 volts for 35000 joules. More information is available here. What do you think? Are you impressed?