I got your e-mail, but for the benefit of anyone else who might be thinking of working a deal...
If I had the cash and were to go out today, I'd be looking at a Rock River 20", 1:8 barrel, flat top. Not really interested in a "tactical" model, I would like a longer barrel. That said, if a "tactical" was what you have to trade, I would not turn it down outright.
I am near Denver.