3 ms·Navy’s Mach 8 Railgun Obliterates Record (w/ video)6 points by Mithrandir 16y agoiwr 16y agoFor a fraction of the cost of an electric gun, they could have built a light-gas gun with better capabilities.ollysb 16y agoOne of the stated benefits is that they don't need to carry explosives on board. A gas gun would not have this advantage.