I regularly see AC-130s flying around here tho I don’t know much about their defensive measures.
It has come to my mind at times watching them slowly circle an area, that even a WWII German 88mm anti-aricraft battery would/could ruin the day for an AC-130 crew.
The WWII 88 battery might get off one shot, the radar, optics & laser target designators would then see that never happened again.