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ATRS had a couple of the 4-16 or whatever they are now, you could give them a call and see if they can get one for you. I looked through one (outdoors at objects over 1000 yards) when I was there and it is a very noticeable improvement over my gen 1 Viper PST 4-16x50.
Mine showed up a week and a half ago from RDRC so they should be in stock some places by now. It's beautiful but was a serious wait since I ordered it in Feb but Vortex kept pushing it back.