Photo does not match the actual product - NcStar 30mm Cantilever Ring Mount Weaver Style

I ordered this ring mount because in the sales photo it appears that the "open see thru" base is clear all the way down to the base mount. The photo shows a large square opening; however the actual product received has a small round opening centered high above the rail continuing to make it impossible to use open sights. I like having that capability due to an eye condition that causes fluctuations in my vision... meaning some days I see better with open sights and on others I need a scope. Not to mention having the ability to still use open sights in a situation of quick response when there is not time to find a moving target in the scope. Anyway, the photo does not represent the true design of this product. Order with caution.