Can't see the pictures here at work. How long have you had it? Most likely wherever you bought it from you can return it still. Problem solved. I'm not sure there's much they could do to the bases given the way they micro-adjust, but there might be some other way.

Check out the Viper line of sights. No micro-adjustable pins, but you still have 3rd axis adjustment. Didn't look at Rob's pin design very closely, but from what I did see, zero pin gap can probably be achieved with his sight.