The Enhanced upper uses our Cold Hammer Forged barrels that are spiral fluted to reduce weight. They include a two position gas block with a bayonet lug that can be switched between suppressed and non-suppressed modes. This feature enables the user to pre-restrict the gas flow to the piston system allowing the rifle to run smoothly and compensate for the added back pressure from running a supressor. We complete the upper with our modular rail in a nine (9) inch length. This handguard utilizes individual rail sections that allow the owner to place accessory rails where they are needed while retaining the slick low profile nature of the rest of the handguard.