The Mk20 is a gas-operated rotating bolt, selective-fire weapon, which was designed as a highly moddable weapon. Its design and front ejection system allows true ambidextrous use. Two other variants of Mk20 exist. The Mk20C comes with a shorter barrel suitable for close combat and the Mk20 EGLM comes with an enhanced grenade launching module.
The Mk20 is chambered in 5.56x45mm. There are three variants: the standard Mk20, the compact Mk20C, and the Mk20 ELGM with a mounted 40mm grenade launcher.
Compared to the MX, the Mk20 does somewhat less damage due to its weaker caliber (though it does have a higher muzzle velocity) and is slightly less accurate, but has a lighter weight and higher rate of fire.
The Mk20 was a standard issue rifle for British forces in the 2020's, used during Operation Magnitude in the early 2030's by members of British and US Special Forces within NATO.
The Mk20 series rifle was adopted by the AAF in 2031 after NATO's widespread adoption of the MX series. In the upcoming years of the 2030's, the AAF were using TRG 21's and experienced a number of malfunctions and the poor quality. They realized they needed new weaponry, so the AAF countered this by buying about 25,000 used Mk20's from the British Armed Forces and painted them in Aegean Digital Green. They discarded their TRG 21's which were taken up by the FIA during the Altian Civil War.
The Mk20 ELGM is modeled with the shorter barrel of the Mk20C but has the same stats as the standard Mk20.