The AC-130 seems like a fairly simple airplane. It’s just a cargo plane with guns sticking out the side, right? Would you believe the going price is somewhere around $200 million? The Spooky has just about the most impressive array of sensors of any aircraft in the fleet.
The big gun is a 105mm howitzer. It is a highly modified version of the venerable Army M102 howitzer. The rotary cannon is either a 20mm M61 Vulcan, or, more likely, an 25mm GAU-12 cannon (frankly, I wasn’t paying attention during that part of the video). The last gun, where the gunner is loading clips in the top, is a Bofors 40mm cannon. Just the thing for busting trucks.