jeepkid - That is a Rock River NM Lower with a Rock River 16" Upper.

Ameetec Arms has a deal right now for an M4 style lower for $200. I was considering buying one of those for my next AR build and adding a NM trigger to it.

The gun will easily shoot 300 yards accurately. I don't own the gun anymore, but I could go rapid fire off my bipod with a 20rd mag at 100 yards and cover all 20 with a baseball if that tells you anything.