The lower is DPMS with a Rock River Armory 2-stage trigger.
The 20" upper is DPMS heavy barrel with Knights Armament quad rails and a Matech BUIS.
The 16" upper is a Model 1 Sales heavy barrel with M1S free float quad rail and M1S BUIS.
The lower with the 20" upper $950 shipped.
The lower with the 16" upper $850 shipped.
All of these items are brand new, only the factory round has been down the tubes.