In the Metro universe, pre-war military-grade (MGR) 5.45x39mm rounds are used as a primary currency for trading amongst the survivors living beneath the irradiated ruins of Moscow. It's always been a fascinating system. It not only fuels Metro's exceptional sense of place and immersion, but always forces players to make a difficult decision:
MGR ammunition is a powerful alternative to the standard rounds most weapons take, but every round ejected from a Kalash in combat is akin to literally shooting your money away. And given the increased challenge in Metro 2039 – a new global faction of human combatants, and monsters who have suffered further mutation in the four years since Artyom and the Spartan Rangers fled the Metro system – currency is king if you want any chance of survival.
