OK, this is a question that was raised on another forum I frequent. Someone noted that a picture of a minigun on one of HMs finest grey war canoes appeared to show rust on the minigun barrels. A couple of people thought it was just because of "reflected sunlight" (though some now are disputing this). However, another picture from an RAF Chinook also appears to show rust on the barrels. As someone who know very little about weapon maintenance etc is this just bad drills, or an unfortunate side effect of being constantly in a maritime/airborne environment? The RN picture... ...and from the RAF.