Exactly what gun upgrades can you get playing solo battlefield 2042?

@ShiraHika as of right now you cant unlock more than 2 or 3 attachments per gun. Basically only the first 40 kills count andnthen progression stops. Its the same with vehicles too. Witg the heli's it only allows to unlock the first 2 things then kills stop counting. Dice said at some point it will get fixed but right now weapon and vehicle progression is basically not working in solo mode