A weapon based on the Gauss Pistol that would have been featured in the original Fallout 3 (Van Buren) 

I opted for a less 'industrial' look, as I thought the original looked more like a tool than a weapon.

It can be found on the Helios One tower, with a re-spawning ammo box containing it's unique ammo type '3.2mm ecp'. It, unlike the vanilla Gauss Rifle, doesn't use MFC's as its primary source of ammo, it also holds multiple (15) shots of ammunition. Also unlike the Gauss Rifle, it is classified as a Small gun (or, rather, just Gun) instead of an energy weapon. I did this for two reasons. First of all, though it is powered by electricity, it shoots a ballistic round, the only difference from a regular firearm is they use expanding gasses, this uses magnets.

It does a not-insignificant amount of damage (60 per shot) and is highly accurate, though, as of now the only place to find ammo is the box on the tower.