Medium range railgun
Not as strong as long range railguns, but much faster. For this reason, it requires an efficient cooling system. In fact, most of its design is made for efficient heat dissipation. When the coolant in the gas cylinder runs out, the gun becomes useless, so the operator has to pay attention to the temperature gauge.
I made a concept and the 3D model in Autodesk Maya and painted it in Substance 3D Painter (at that time my painting skills were much lower than they are today).