When you are playing on the Factory map with the Automatic weapons, go to the spacious end of the factory where the AI opponents respawn (where the Kronen SMG and Heavy Armor is) then from there hide in the dark while crouching for easy kills. Also where the ramp is in the same area, hide in the left side while crouching and wait for opponents to run by backwards while they shoot at other people and then gun them with the Kronen SMG.