Notice how in the list it says "gunpowder" and "energy"
These are likely referring to methods of propulsion, which means that the magnetic gun may or may not be a Gauss Rifle, as Gauss Rifles operate on the principle of accelerating stuff really fast using electromagnets and using them to kill things. However, a Gauss Rifle would likely propel the ammunition fast enough to prevent the bullets coming back towards you. Thus making the Magnetic Repeater a good choice for high-power kinetic-piercing weaponry, however a laser rifle would have the advantage of little to no perceptible travel time (I mean a Gauss Rifle doesn't either but light is way faster than everything else when traveling as fast as it can go)
So you could go either way. The only reason why this would go awry is because you're a robot and Gauss rifles use very powerful magnets to propel things at high velocities.
It could also be a railgun, which operates on the principle of using electromagnets to propel stuff really fast.
