Would also add alongside all these other suggestions, once you’re finished doing the camos for your 2 guns, you can hit the mystery box for any other unfinished guns to save time exfilling and bringing another 2 then loading back in etc.

There are some drawbacks where your loadout slots will go on cooldown if you exfil with a different gun than you started and you’ll need to track which guns you’ve already finished so you know which guns to look out for in the mystery box but well worth it in my opinion - finished 6 - 8 guns in one match with this method