In the 1960s, the Cordian military realized that their MGP-1934 machineguns were fast becoming outdated. Heavy, unreliable and awkward for infantry to use compared to modern designs, the venerable Pattern '34 needed to go. It's replacement, the MGT-66, was partially based on the Belgian FN MAG, and proved to be both accurate and very controllable at range, as well as extremely reliable. The MGT-66 operated on the so-called "constant recoil" principle; the bolt carrier never actually touched the rear of the receiver, and so felt recoil was greatly reduced.
The MGT-66 was produced in two varients: Medium and Light. The Medium was chambered in the 7x55mm Cordianm and export versions were offered in .280 British, 7.62 Nato and other large calibers. The Light was initially chambered for 7x40mm SPAC, but eventually offered in a number of common intermediates. Within the Cordian military, the 'L was a Squad level weapon, being issued to the squad support trooper and was mainly used for suppressing fire. The 'M was issued at Platoon level, and it's dedicated MG team was mostly employed in wiping out sniper nests or RPG ambushes. An "H" variant was also produced, chambered for 13mm Cordian or .50 BMG, but was a mounted-only weapon designed for vehicles, and was eventually re-designated HMGT-70.