Carbon Arms builds these uppers on a high quality 7075 T6 forged receiver that has the mil-standard hard coat process and is then coated with Black Teflon®. The foward assist is plugged with our own machined PlugAR. The barrel is the stainless Nordic 18" competition barrel with rifle-length gas, 223 Wylde chamber and a 1:8 twist. We use a Carbon Arms SS mini gasblock and Mil-Spec BCG. We use the Nordic NC-1 handguard, Nordic HD charging handle and Corvette comp.
We have tested this group of parts extensively on the range, over the Chrono and in major matches. They offer excellent accuracy, speed and reliability. Sighting system and Lower are NOT included.