Im in the market for one of these, I think. I want to stay around $200-250. It is going on a 16" flat top AR15. I just have never used a red dot and dont know the difference between 4moa and 2moa dots. Also I see they come with 2x doublers, can a magnifier go behind them? What would the magnification be? 6x? Id like a cqb sight but also be able to make 300+ yard shots too. Maybe it would be easier to stop by your shop.