I did actually put some thought into this. I’d hoped it would be a bit of a javelin-cross-fusion blaster, made out of recycled materials by an innovative survivor. Javelin in that you would only carry around two or three rebars, and that they would always persist after you fired them. Fusion blaster, in that it deals a lot of damage at a rather short range. They could be kept handy for the bigger and/or armored opponents.
I didn’t intend for a whole new weapon to be created; maybe a mod at the most. I actually agree that there could just be a new ammo type – rebars – that were heavy, maybe took a while to reload, flew shorter than a normal bolt, and dealt very high damage. By ‘like a coilgun’ I meant that it would draw power from a UPS after firing or loading because of the power needed to heat the bolt, not because of an actual electromagnetic coil. Since the bar is red hot, that probably wouldn’t work anyway. If the weight/volume is still an issue, maybe we could add an ammo recipe that uses a rebar and a hacksaw, or something.
The only thing I hadn’t taken into consideration was that infuriating ‘Choose ammo type’ menu, and I apologise for that.