>  Newton's third law still applies, even at relativistic accelerations.
> If a force is applied to the projectile to make it accelerate at a certain
> direction, another force will accelerate something else (ie. the gun)
> at the opposite direction. I can't think of any way of avoiding that.

Bolt it to the Earth, then (assuming you're measuring recoil relative to the 
Earth) the recoil will be avoided.

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