I do this occasionally to prepainted things if I dont like the way it is painted. Haven't actually tried it on a nerf gun yet, but you could just go at it with sandpaper itself and just sand until you see the real plastic color beneath. or just sand until you feel it is smooth and then apply a thin but adequate layer of primer. the problem with this is when you get to places with ridiculous amounts of crevices or just taking off too much material that it weakens the plastic.
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