What is the point of 'guns' on a jet fighter anyway? Particularly one with only 511 rounds!
This is by no means the first time this has happened to a jet pilot. I don't recall the dates or details, but an unwary pilot of an F6 many years ago ran into his own rounds. The not thinking straight pilot descended after firing his rounds and flew right into them. I guess he forgot that rounds just fired are going to lose altitude. Had he climbed quickly and/or turned right or left, he'd have missed them entirely.