The AC-130 is the world's biggest flying artillery gunship - nicknamed 'Hell in the Sky.' With three side-firing weapons, a 25mm gatling gun, a 40mm Bofors cannon, and a 105mm howitzer, it's easy to see why it got its name. 🎥Air Warriors | Smithsonian Channel Aviation Nation

Used by the Germans in WWII, the Pak 40 makes other anti-tank guns look like toys. It can fire 10 shots per minute, and the force of one shot can blast through half a foot of steel. Watch as host Paul Shull fires one in the empty desert. 🎥The Weapon Hunter | Smithsonian Channel Aviation Nation