Early game it's seemingly better to play your Scav (which has a 20-minute cooldown) each time it is accessible. Attempt to remove with the free Scav gear you are given, and afterward take that Scav gear on your next PMC run. Become acclimated to what firearms work for you.
at that point you can begin to organize finding those sorts of weapons in www.lolga.com
an assault and carry them out with you in your optional weapon space or sack.