I like the idea of these rail guns. I notice that they are still in the development stages. And from the second video posted, that they are still working on the gun itself, and not so much on what ammo it uses. The ammo can always include smart technology, look at all of the different mods they can put on the older outdated dumb bombs to convert them. I think that even if we are not mass producing them, or even to make more than a dozen of them, the R&D that comes from them can or will be used for future endeavors, both military and civilian. I am sure that the NASA, and the air force would both love this tech in their space programs. As to how useful on the battlefield, well that will always come to what ordinance is best or available for the given situation. As to accuracy of the rail gun, or even the cost of operation is an invalid point at this stage of development of the gun. With more information on the gun itself, the barrel can be made of better materials or have better coatings. Same with the ammo. A better capacitor system can be made for a faster RoF. Even cooling, (water/coolant), of the barrel and heat generating parts. There wasn't even a mention of an auto loader for the gun in the 2nd video. On the cost of R&D for this, it is in the best interest of our military to provide funding for it, even if it is not a feasible weapon, we will know more about how to track other countries that are employing it, and what it's weak points are. I would imagine that an EMP weapon could very well turn a rail gun's computer/control system into relative junk, or at least raise the cost of it's shielding up greatly.