DPMS ARMS/PSA DR-15 w/ 13" Quad Rail and Magpul MOE Furniture.
From the Manufacturer's Website (Upper Receiver):
Barrel: 4150V Chrome Moly Vanadium Steel. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a Mid-length gas system. This A2 style profile barrel is nitride treated for accuracy and durability. Barrel is finished off with a low profile gas block, a custom 13" quad rail handguard, and an A2 flash hider.
Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability.
From the Manufacturer's Website (Lower Receiver)
We start with our standard single-stage government-style fire control group, finely polish the contact surfaces and then coat the hammer and trigger in a super slick nickel finish. The result is a trigger that is substantially smoother than mil-spec. A great economical upgrade. This lower is finished with a Magpul MOE Carbine Stock, Magpul MOE Trigger Guard, and Magpul MOE Grip.