We're happy to announce that thanks to effort of @johnb43 FK Mods now contains a major balancing effort.
You can find full changelog here: https://pastebin.com/GxrDiL4Z
The important bit is that your saved loadouts may be affected - many items now have different weight, namely some ammunition types. This may lead to situations where on loading your loadouts you may not load with all the ammo you have put in them.
Generally speaking most affected by this would be MG belts.