When I first got my DPMS AR-15 I tossed everything on it including the kitchen sink.
Playing to it's strengths, I reduced the hardware I piled on it. I replaced it with a 12x Scope and a bipod.
Configured this way it better exploits the bull barrel. This baby has groups that can be covered with a .25 coin at 100 yards.
--I need to find a longer range.