One of the benefits of this particular system is its ability to remove carbon fouling from the bolt-carrier group and upper receiver. Unlike direct-impingement systems, which can contribute to fouling inside the receiver, this gas-piston system continually works to ensure that major components are free of carbon build-up, leading to a more-reliable operating system. Contributing to the reliability of this unique operating system is the inclusion of a gas piston-rated heavy action spring combined with a tungsten-filled heavy buffer, both of which are tuned to the cycling rate of the MK-18 rifle.
In addition to the gas-piston operating system, the SWORD International MK-18 rifle is equipped with a single-point cut rifled barrel, which is nitride-treated for durability and corrosion resistance. With this barrel, the MK-18 has been tested by the company to provide 0.5-MOA accuracy. Surrounding the barrel and gas system is a free-float handguard complete with M-Lok attachment slots for accessories.
Other features of the SWORD International MK-18 include a specially tuned muzzle compensator, which is designed to eliminate muzzle rise and reduce felt recoil, as well as an ambidextrous magazine release and bolt-catch pad. In particular, the ambidextrous bolt-catch release allows shooters to lock the bolt to the rear or release a locked bolt without having to use their support hand or move their strong hand from a firing position.
The overall length of the rifle is 45 inches, and the gun weighs 13.25 pounds with an unloaded magazine installed. Consumers can choose between three hardcoat-anodized finishes for the gun: black, coyote brown or regnar green. Each rifle ships with a 10-round aluminum magazine.