Just keep playing. For some reason, all the good guns are locked at the end. DICE has no clue how to create balanced weapons it seems. The last pistol is a two shot kill. It's pretty freaking stupid.
Until then just camp using honing missile and sniper rifle, and wait for the ATST or Hero pickups to become available. Whoever gets these pickups usually ends up posting ridiculous numbers like 80-0. So yeah. The game is pretty freaking broken, but it's still a lot of fun because of its casual nature. Dont worry about your KDR and just play it for the experience until you hit level 25 and unlock the DL-44.
P.S You can play Fighter Squadron to quickly level up. Games dont last too long and you can clean up on AI kills. The same rules apply here. Wait for the Hero pick ups (Falcon or Slave 1) and go nuts. Here is my gameplay from last night. Went 11-1. Falcon has pretty much unlimited health and kills everyone in a few shots.
https://www.youtube.com/watch?v=kDskVpIMSd8
Thank you so much. I noticed I kept getting killed by that pistol which was annoying.