I have them set to fire at will, long range, any aircraft. I've tried every other setting as well. In just the last ten minutes I had the big gun and one of the smaller guns firing at a target, but the other 2cm just sat there picking his nose.
It's not an issue of the AA guns being unable to target an aircraft due to position. When I'm firing at a plane and then hop off the gun the AI should pick up where I left off. It doesn't. Two 2cm guns side by side should be able to target the same aircraft as well.
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