Racking the slide does not FULLY precock the striker. IIRC it precocks to approx 72%(or there abouts), this is said by Steyr, to not be enough to ignite a round should the sear somehow slip or malfunction. Only by virtue of pulling the trigger rearward to complete the cocking action can a round be fired. Similar to the Glock, but having more precock, hence a better trigger(in my opinion.)