DC Coil Bypass Railgun

Using iron core to direct magnetic field away from current carrying wires, in a linear dc motor, preventing the return line of cancelling dc motor movement, the iron/ceramic fins also function as coil wire slots to wire the coil around the accelerator pipe, the accelerator pipe needs to be non-magnetic non-metallic ceramic tube (or similar), the coil wrapping can be on top/bottom Picatinny rail.