You NEED this for home defense. If your neighbor bought a tank....
http://www.engadget.com/2015/11/09/this-awesome-diy-railgun-fires-rounds-with-27-000-joules-of-forc/
27,000 joules equates to 19,914 foot pounds energy. To put that into perspective, a .50 BMG (the round used in the vehicle-mounted M2 heavy machine gun and the massive Barrett M82 sniper rifle) generates a maximum of "only" 15,000 fpe. But possibly the most powerful (and totally impractical) rifle round is the .905, with up to 38,700 fpe...or about as much as a 20mm Vulcan cannon round.
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