I propose discount for T2 once T1 is built (and other way around as well) without adding anything.
Once T1/T2 is up, T2/T1 is cheaper for let's say 40-50%, so if you need AT you just tech up.
PTRS for Penals out of every possible solutions is the worst one, sorry.
___
Tho I'm still for M-42
![Honor icon](/images/replay/honor_icon.png)