r22r, sfoster has anwered your query, but just think about the alternative:
If you could NOT withdraw the bolt after cocking it, then that would mean you would be COMPELLED to fire the rifle before withdrawing the bolt. That would be a pretty hazardous design, and I doubt that any rifle has ever been designed like that. (That's challenging fate - somone will now enlighten us all by naming an example of such a lunatic construction!)
Patrick
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