Patriot Ordnance Factory Dictator Carbine Length Gas Block, 9 Position, Direct Impingement, Gas Tube Included, Black Finish 00837 This 9 position adjustable DI gas block provides the ultimate range of adjustability and versatility. The addition of a suppressor typically increases the level of back pressure within the rifle system. This increase will prematurely wear parts and increase the amount of gas/carbon introduced into the chamber. With the DIctator" you can now control that rate of fire" gas flow and ultimately the reliability of your system. Each DIctator gas block kit comes complete with the applicable length gas tube.