What about inertia?
Of course there would be recoil, it's just unlikely to be a big factor.
Just remember that "for every action" ie the projectile moving forward, "there is a equal and opposite reaction" ie recoil.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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