Faxon AR-15 Duty Series Upper Receiver Assembly featuring a 16 inch Gunner contour barrel chambered in 350 Legend. Suppressor-capable upper designed for AR-15 platforms using 350 Legend. Gunner contour reduces weight while maintaining chamber strength for durability. Core includes a Faxon Duty Series 4150 CMV barrel manufactured in-house with advanced machining heritage. Ready to pair with a compatible lower receiver.