“The AC-130’s ability to fly low and slow over targets for long periods makes it perfect for close-air-support missions, but that’s also a weakness, as it makes the gunship more vulnerable to antiaircraft fire.
Discussion about removing the 105 mm gun is part of a broader effort to make US aircraft better suited for conflicts where opponents can contest or deny control of the air. In addition to removing the gun, Air Force officials are considering arming the AC-130 with cruise missiles for long-range strikes. The service has also explored equipping the gunship with laser weapons.
However, BA, a former AC-130 gunner, told Business Insider that removing the 105 mm gun “would have a big effect on the capability” of the aircraft.”
https://www.yahoo.com/news/fight-survive-hostile-airspace-us-113701467.html