Vortex Viper Enclosed red dot

I bought this Vortex Viper enclosed red dot a couple months ago from Bass Pro (single setting red dot model). Awesome sight because you don't need a mounting setup, as it attaches to a vast number of stock shotguns as long as they're drilled/tapped. Put it on my Winchester SXP only to find I have an astigmatism and can't see the red dot properly. It does work properly, as per the photo. So, it's brand new, works awesome, taxes in was about $600 so, just trying to recoup what I can. Really disappointed because I was pumped to have it on my slug gun, but, my loss is your gain.