Judging from the big ol’ cannon sticking out of the side, that’s an AC-130. Those are very bad news for adversaries on the ground.
The main gun should be a 105mm howitzer, I’m having trouble seeing more but there should be at least one 40mm Bofors also. They used to have 20mm rotary cannons, but not any longer as they were considered too short-range.
The AC-130 that yarddog posted is either a AC130H or AC130U. I can’t remember if the U’s have the cheek blisters on them yet.
They have the 105, as well as a single 40mm, and a single GAU-12 25mm gatling gun.
The 40 is just forward of the 105, so just under the trailing edge of the wing in the second pic, and the 25 isn’t deployed.
The original Vulcans were removed because of incompatability with precision trageting and an insufficient slant range to keep out of MANPADS range.
There is now the AC-130J that’s going to be tested in a few months, as well as the interim AC-130W. The W’s are armed with the 30mm Bushmaster and the AGM-176 Griffin or Viper Strike, SDB’s or Hellfires