I own many Bushnell Banners, they all keep their zero once sighted in. Since I carry them on the handle bars of motorcycles, snow machines, and 4-wheelers, Also slung on the side of horses that fall occasionally, some have been damaged. I sent them back to Bushnell with a letter as to what happened. In every case they have replaced them free of charge. Have taken many Moose and Caribou looking through a Bushnell Banner scope. Only had one bad out of the box. When I sent it back with a letter of explanation they sent me a replacement with an upgrade.