First and most importantly the 516 is made by eotech while the 4x with FTS mount is a clone. I just want that to be clear that the optic itself is real while the magnifier and mount are not. The glass is crystal clear and it does not enlarge the reticule like other clone magnifiers do. The magnifier is all steel construction as well. I very happy with the set up however I wish to move up to a Valdada since I have some astigmatism symptoms and want an etched reticule to alleviate this. I am asking for 450 shipped for the setup priority and insured. I wish I had a better cam to capture how clear the glass is but I have a POS so if you want better pictures, you will have to wait until the weekend when I can get my woman to bring hers over. On to the pics