5.62×47mm NCP

"Well, that looks different from the 5.56x45mm NATO cartridge, but this one is the 5.62x47mm cartridge. So it seems that the New Central Powers have made this new type of cartridge, well, these trigger-happy folks sure have the right time that they'll get different cartridges too. Pretty cool, isn't it?"

--Su Ji-Hoon, Alike in Journey

The 5.62×47mm cartridge is a rimless bottlenecked Intermediate cartridge. It will be developed in during USRAC War by New Central Powers that it will be official cartridge to every new firearms of New Central Powers

Only happened in during USRAC War that member states of New Central Powers could make their own new cartridge for their new firearms use,which 5.62×47mm cartridge was born and different from 5.56×45mm NATO.