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Railguns would work in space, and I don't think they would push back against the user. The force is a result of the interaction between a magnetic and electric field, and I don't think it's transmitted back to the rear of the gun. I could be wrong (maybe there's an interaction between the fields and the gun itself that I forgot).
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Newton's laws of motion would suggest that yes, there would be a recoil. Equal and opposite forces etc.