I used to love to see and hear the A1 Skyraiders come in on a gun run in VN,Laos,and Cambodia. They not only fired 50's,they also fired 20 or 40 mm cannons,I don't remember which right now.
They would dive down so close you could see the pilot smiling as he pulled out of his dive to fly away,and see his leather WW-2 headgear and a lot of those guys also seemed to like wearing scarves.
It was just like being in the middle of a WW-2 movie. We loved the A1's because they could come in lower and slower,and put it where you needed it,and they could stay on station longer than the fast movers. Plus,they were less likely to drop it on you than the fast movers were.
I have to admit I liked them the most when they were also dropping napalm,though. NOTHING works like napalm to make the bad guys want to go away.
I have never see one operate personally,but I understand the USAF aircraft they call a "Wart Hog" has been doing an excellent job of replacing the A-1's,though. They can't fly quiet as slow,but they can carry more ordinance,and with the improved bombing and strafing capabilities available today that really means something.