I'm considering an optic for my AR. I want a variable power either 2-7X or 3-9X with mil-dot reticle. I don't really want to spend a lot of money on this, it spends almost all of it's time in the safe. I seldom shoot it but want glass on it when I do. I see a lot of low dollar scopes out there, some as cheap as $70, but have no idea of quality. I know quality optics aren't cheap but I'm looking for a "good enough to get by" scope. Does anybody here have any real life experience and advice concerning the low dollar AR scopes?