nikon 100%... on my slug gun i have a nikon slughunter its perfect for the gun. if you have just a 12 ga shotty i would suggest a truglo red dot scope or something like that. for a slug gun a nikon or leupold scope would be the way to go. personally i dont think there is a need for anything other than iron sights or a red dot scope on a regular 12 or 20 ga shotgun. most of your shots are within 60 yards anyway.