I have a brand new Sightmark 3X pro magnifier with the flip to side mount, I was going to use it for my real steel AR but I opted for a short dot instead, this has only been mounted on an (at the time) unfinished AR upper, there are no marks on it whatsoever and the glass is crystal clear, these go for about $150 on OpticsPlanet or about $130 on Amazon, comes with everything that would come with it if you bought it brand new, even the Allen wrench, if anyone is interested hit me up and we can make a deal, thanks everyone