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Well I'll try to put it into simple, and hopefully correct, terminology:
Say you're trying to pull or push an object and you're floating in a vacuum (suspending the whole biological impossibility of it). You have nothing to resist against, so you can't move the object without moving yourself as well, correct?
Same thing applies to this magnetic force. It has to push one object away from another. In the case of a railgun, it is pushing the bullet away from the magnet. As the magnet pushes on the bullet, the bullet pushes back on the magnet. This pushes the whole gun into you. The only reason the bullet goes forward and the gun doesn't go backward (not too far at least) is that you're there to resist the push of the bullet.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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