I was watching a rust review and i was wondering how hard it would be to make a gun, if you were trapped on a deserted island starting with?

just a rock. lets say a modern assault rifle.
Update: no i mean a deserted island so no modern stuff to help. meaning with just a rock you have to build all the stuff needed to make the gun. if that means using the rock to build something else to build something else etc surely it cant be easy.
Update 2: let me rephrase the question a bit. you appear naked on earth before the time we built even one tool. spawning naked with just a rock you have to somehow build an assualt rifle.
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