Gungans?

I’ve always used GAS as counter to gungans. New bad batch I use vs Reva first and malgus second if no Reva. 

the reason gungans are able to spawn in a new shield gen is because it works as a summon. Boss Nass has leader abilitie (if all allies are gungan, spawn shield gen). In short, you have to take out boss to get rid of the shield. That’s where GAS come in handy, lots of buffs on gungans. Still target the gen and use GAS armor shred on a gungan.