Continuing with General Atomics again and using the same electromagnetic launch system is the railgun. There is a great video posted at the Popular Science article page of the General Atomics’ high speed railgun. A press release about the last test was released in December 2010.
Here’s an exclusive Defense Tech video giving you an update on General Atomics’ high-speed railgun project. Last summer, General Atomics and Boeing tested a high-speed sabot round to replace the “hypersonic bricks” (which tended to tumble out of control) that the company had been firing from the gun, says General Atomics’ Tom Hurn. The sabot round went seven kilometers downrange after punching through a 1/8-inch thick steel plate. General Atomics officials estimate that they could install the weapon on a DDG-51 class destroyer by the end of the decade, according to Hurn.
Read more: http://defensetech.org/2011/04/14/we-were-launching-hypersonic-bricks-at-mach-5-mach-6/#ixzz1K7CQXVPD
The projectile was designed by Boeing.
The above videos practically give away the technology. I’m afraid that anyone could make this if they really wanted it. The technology is not that complicated. They would need a large number of capacitors and some slow charging circuits, plus material for the rails, projectiles, etc. Of course, the stability and accuracy of the trajectory will have to be improved upon for a DIY railgun with some expertise and time.