new meta in warzone

Since you're new, first thing you should do is grind and upgrade one.
Even if it was slightly nerfed KRIG still slaps, AK47 if you learn to control recoil or use it as a close-midrange weapon. GRAU and M4A1 are always viable long range weapons.

For close many will do: Bullfrog, Gallo, Mac10, CW MP5.