Functional but appears defective - Holosun HS503BU Micro Red Dot Sight

This unit came recommended from a highly reputable source. It works as advertised with one notable exception.

The front glass appears to be installed crooked. When you look through it there is a shade of red on the right side of the glass. It is primarily noticeable in low light situations. Not noticeable in bright light.

I called to get an RMA number to return it because I was concerned the glass was not installed properly and would fall out or break during use. When talking to the Customer service rep, I was told that the glass is supposed to be installed that way. Given the fact that this has come up in previous reviews, its possible. If that is the case, Holosun should document that somewhere because I really don't believe it. So here is the deal - if it continues to work and the glass doesn't fall out, then its worth the $160 bucks I paid for it. I won't buy another one. If it breaks, I will throw it away and get something else.