Firing at enemies automatically, just like how enemy AI is targeting us, I think it's possible to implement this as part of building our aircraft.
The idea is:
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This part consist of an operator with their weapon (operator 3d model can be toggled to displayed or hide them to improve performance).
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There are variation, like mounted mg with limited aim (aim angle can be adjusted in settings) or turret with 360 rotation (rotation can be limited in settings).
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Weapon Properties Customization, total amount of machine gun (single/twin/quad), damage, rate of fire, bullet spread, ammo, range.