I see there are some BFR shooters here and wonder if anyone has had any experience with the HiViz sight that Magnum Research offers in their flyer. My 10" .45/70 is scoped and shoots like a rifle but I wanted to keep the 6 1/2" .480/.475 with irons. Have heard that these things are fragile and also wonder how well they work in dim light in a hunting situation. Thanks