Talk:The Future: Eve of War/@comment-26031225-20160329075440/@comment-26031225-20160329080546

Top 4 = Railgun V, can develop Railgun VI

Top 10 = Railgun IV, can develop Railgun V

Top 20 = Railgun III, can develop Railgun IV

The rest = Railgun II (Railgun I has fell in disuse in most armed forces and it's used by street gangs and small guerrillas), can develop Railgun III

As always, you can have either of these automatically if a nation that already haves it decides to give it to you.