Thx guys!
Just now I saw a typo. It’s a Gatling gun with a G at the end, not Gatlin…
Skybert, all Belgian F-16s have a part of that housing used for Carapace RWR (see article on my site). So if we would ever decide to use a dragchute, the whole to pack it on, would be only have the size of a normal Viper! Wouldn’t want to be a crewchief then!