I don't know what to do? I've had my EXPS3-0 for about two years. I don't shoot with it on the gun all the time, it still looks new, I have the box but no receipt. It works fine but for $600 I don't want to find out later it quit working. I really like it, but what to do? I would like to know if this is a small window of opportunity or an ongoing buy back.