Honest Question: When was the last air to air shoot down with guns?
Hmmm.... The shoot-down of an Iraqi helicopter by an A-10 with its GAU-8 during GWI?
(IIRC, the Hog pilot said, "It just came apart..." ) <GRIN...>
Rumours of gun kills during the Eritrea-Ethiopia war in the late 1990s. During the Falklands there were gun kills. Sea Harrier against C-130 and Pucara against Westland Scout helicopter. On March 26th 1999 the lead F-15C pilot switched to guns after thinking that his AIM-120 AMRAAMs had missed the Serbian MiG-29s. The AMRAAMs had hit the two MiG-29.
Honest answer: probably during the VN war.
When was the last time grunts on the ground were saved by a gunfighter in the air? Probably not long ago.