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I'm not an engineer and I've never flown a plane (let alone a fighter jet) so you could say my idea isn't well informed. But just looking at it, it doesn't seem too far off to think about attaching more, maybe smaller gun pods to the other external hard points. With the Air Force version that would be a total of 6 guns.
Again I'm not a pilot so I'll admit I don't know how practical that would be but I think it would be a cool sight to see, almost like a throwback to those WWII planes where they just had 6 guns built into the wings.