Honestly you should probably just be using a smartscoped L42 so that you don't FF marines until you learn how firing lanes work in SS13/CM. I could be a wee bit motivated by the number of times I've had a PVT magdump AP into my back.
If your NCOs are half-decent they'll dump req so you can usually snag a smartpistol kit as well. The ammo burns quick but it's a nice tool for getting used to shooting on the move.