I think if the mag gets dropped on a hard surface the impact might be enough to distort some of the metal works inside. I had my 553 ELX on a Gitzo studex that went ass over backwards from a sudden jet blast. It landed squarely on it's A-12 hitting a concrete tarmac. Took the licking and kept on ticking but not for much longer when it jammed. Sent it to the David Odess Memorial Hasselblad Hospital and for $95 bucks, he performed life-saving straightening measures. Yeah. It happens under Murphy's laws I guess.