If you 'pull' the trigger - ready to fire the shotgun - on an O/U shotgun - is opening the action and removing the shell (while keeping the trigger depressed) the only way to disarm / make safe the shotgun? Many years ago, a fellow showed me his'n, and that's the way it operated. Are all o/u release triggers like that? - Not looking for one - just curious - thanks in advance to all you knowledgeable people here - I'm just here - studying at the feet of the Masters.