I've just made some thoughs about weapon upgrades (because of pfusilers) and mentioned one thing.
For some reason, some upgrades autoremoving other upgrades and you can't purchase them, some others - don't.
Paratroopers (works with Thompsons, but doesn't with M1919)
Infantry Section (works with all upgrades)
Maybe it can be applied to all infantry upgrades and finally solve issues with non-intended combinations of upgrades?
