[quote=Maxxorlord]
Why would we be using such outdated guns? I mean, its 2058, right? There's bound to be a whole load of weapon advancements in that time span.
[/quote]

Budget cuts when everyone needed funding to make mechs? 

I'm joking of course, but honestly in the next forty or so years, I don't see tank cannons and weapon calibers changing too much. But right now the whole "let's throw every superweapon we can think of on my mech" thing has me on edge, so just to be on the safe side, I'd like everyone to base whatever mech weapons they want to use for the Tortue on modern specs unless they can reasonably think of and explain the research, development and deployment of an advanced weapon that might pop up in the next four decades.