They may be a staple of sci fi, but in reality they are still little more than a range toy. Here is a video in which Ian McCollum of Forgotten Weapons interviews David Wirth of Arcflash Labs talking about their latest product, the technology, the potential future and the difference between a Gauss/coil gun and a rail gun.
Source: https://www.youtube.com/watch?v=NIl1XmEDdVY