US does have good AA - it's solid in all respects. High damage, fast reload, decent spread, available at low levels, and can carry anti-ship shells. They only lack superduper range - but then, that would make it overpowered.
To AA effectively, you need manual/Aiming FCS - it's due to the "golden angle", the angle (and therefore altitude) at which your AA shell flies that will allow the shell to be at the same height as aircraft at default/max height, and thus hit and explode. If you use auto, every time you click to rotate your turrets, you're also probably changing the angle of the gun, which messes up your golden angle.
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