I've got a rock river. It's a 20' with a stainless barrel and 1/8 wylde chamber.
Also have a Bushmaster. 1/9 and 14.5" barrel. It was my first ar and I bought it right after the 2008 election, it was all I could find.

As soon as one of them fails I'll be right here to tell everyone about it. Thing is I spend most of my time shooting one of my daniel defense rifles or my scar17 or my spikes 5.45. So they don't get a lot of use.