I was reading in Outdoor Life and online about the new nano technology rifle scopes that all the major manufacturers are working on now, and the first few models will be out for Shot 2018. Bottom line, the internal lenses are made up of many layers of polymer that are fused together to make perfect lenses that are lighter than glass. The other benefit besides weight savings is they can be formed to give a wider range of magnification in the news scopes. So, in 2018 we'll see high end scopes that weigh 6-8 ounces and give you a very bright 2-20X40 to put on your favourite rifles! Bushnell, Leopold, Swarovski, Leica, Nightforce, and Zeiss, along with several other companies, are working with this new nano tech and will be putting out rifle scopes, beginning next year! Sounds like a great way to finish off a mountain rifle build!