A rebounding hammer with come back to a half cocked position after the firearm is discharged. To fire the weapon again you must work the lever action to cock the hammer back. It is a relatitively new safety idea, that IMHO...sucks! You cant pull the trigger on a lever action rifle if you dont cock the weapon first...period. There will not be a live round in the chamber again until you cock the weapon, least where I come from each bullet is only good for one shot.