The front trigger fires the more openly choked barrel which is right for sXs and bottom barrel for O/U when set up for right hand shooter. My numero uno recommendation for new shooter has been PB 'Essential', 'White Wing' or 'Black Wing' with choke tube system. In 12ga these weigh right around 7lb and are quintessential "knockabout' doubles of modern age. Great expensive all around shotguns.