I have a DPMS (I don't remember the model number). Mine has an 18" bull barrel and weighs a metric ton. It is a fun toy and shoots very well, but no fun at all to carry around.
I shoot black hills 168 grain BTHPs and they are only going 2450 FPS from my short barrel, so its a pretty weak gun for hunting.
These seem to weigh about twice what an ar-15 weighs and I would not recommend it for a hunting rifle. Its heavy and the short barrel makes the 308 really weak. These types of guns are also very clumsy and uncomfortable to carry slung.
I really love mine and would recommend it to anyone as a fun toy, but I have yet to take mine hunting for anything.