As I recall the original Specter had four 20mm vulcans and two 40mm Bofors. Experience quickly lead them to favor the 40mm as these had better standoff range. So they removed two of the vulcans and placed a 105mm cannon in the rear.
My uncle served as the TV\FLIR operator in the reserves for a time. He said that the 40mm rounds being WWII and Korea vintage often where duds and they had to unjam them often. I think they where thinking of using a single barrel cannon in 25 or 30mm range similar to the Bushmaster used on Bradleys and several USMC AFVs. These would replace the Vulcan and bofors. Some had the two 20mm vulcans replaced with a single 25mm.
I would say with modern technology a single chain type cannon like the bushmaster and a 105mm would be very effective. Now even 25 and 30mm rounds can have proximity burst capacity. Just imagine air burst 30mm shells and spot on 105mm raining down on you. Pretty much you're wasted.
I guess an Apache comes close except an Apache can't loiter and its 30mm is not as accurate. Flechette tipped rockets are very deadly but loadout is limited. Same issue with the hellfire. A Specter can loiter and drop 105 rounds all night and its gun is only covering you while arty at a FB also has to cover other areas. You can simply wait for the Apache to run out of fuel or munitions with a Specter you can't wait him out.
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