MK18 is our original Close Quarters Battle Rifle. Chambered in 5.56 NATO along with its proven reliability and compact frame makes it the Ultimate CQB platform. The match grade 11.5″ barrel enhances the weapons accuracy when the operator is forced to engage targets at longer distances. Our 4 position piston regulator allows users to easily regulate their rifles firing rates. Our piston regulator has 4 setting normal, adverse, suppressor and off setting. This allows the system to run cooler and cleaner during hard use. The regulator can also be removed and cleaned without taking the handguard off. This rifle is a CQB dream rifle.