EU Questions & Answers

Listy, on 07 June 2012 - 05:09 PM, said: Thanks overlord, that's going to make allot of people happy.
And the obligatory question:
133mm Gun? Who? What? Where?
I said ealier the closest I've been able to find to that calibre is the 1980's 140mm development, which didn't go anywhere. What is the basis for this gun? Or is it a balance propelled fictional weapon?
Thanks.