Quoting TerribleNate, reply 16Quoting Pat_22_, reply 15Quoting ZJBDragon, reply 14Yes but there's an engine behind that railgun, and the engine is not empty.
Learn about rail gun tech, there is plenty of non-classified material available and I can provide you some links if need be. I agree for esthetic purposes that there should be something covering one end up however from an actual tech point of view there is not necessarily anything there. However this is neither here nor there, what it comes down to is the artist artistic intention.