Rosco Manufacturing Purebred, Saucepack, Barrel, 223 Wylde, 16, Mid Length Gas System, Fits AR-15, Beadblasted Finish, Silver, Includes Bolt Carrier Group, Gas Tube and Non Adjustable Gas Block SP-PB-16-223-BCG-GTM-NGB-001 The Rosco Sauce Pack bundles were created after direct requests from Rosco's customers to provide them with the key components needed for their carbine/pistol builds at a great combined price. The result is a hand-picked list of parts that will produce results right out of the box. All parts within these kits are designed to synchronize together and create an un-interrupted system that will bring every individual component to its peak performance level. The perfect marriage of all their available Bloodline accessories and their in-house made barrels will make for the ultimate combo in performance and cost savings.