Updated: Apr 1
A really well thought-out article by author Tim Mullin in the current The Rampant Colt magazine, outlines a notion that I also had deduced: that the real purpose of the Fitzed guard was to prevent the finger from being broken inside it in a gun grab.
What would Gaston Glock think of Fitzing? I see he is still living, in his 90s:
For the complete article get yourself a copy of the mag :-).
As an aside, an FOH (Friend of Holstory) sent this along: a rare Glock that he imported directly from Tasmania that is the island state of the 7 states and territories of Australia. The Glock was TPD issue (which they officially deny, just as Glock denies the pistol even exists). It's special because it has a factory thumb safety:
How fun! Below is a set of images from Mullin's Fitz article, showing some ways in which the missing guard can prevent a broken finger in a gun grab:
I developed this theory, too, while perusing Elmer Keith's "Hell I Was There" a few years ago; the 'expert' is Fitz himself (p.s., his name is correctly "Fitz Gerald", which the Fitzgeralds tell me makes him a 'Big G Fitz Gerald'; and this correct spelling is why his birth date was left undiscovered in Find A Grave until I enquired of the family, located his grave marker there, then added the info to his Wiki entry).
Telling editor Roy Huntington of my theory, he then had the gall to claim to a friend of his that he instead saw a film of Fitz explaining this purpose; which I doubt appeared so suddenly afterwards (or that Fitz ever admitted his trick):
The rest of us, relying on the sages such as Fitz himself and Charlie Askins, too, were not ever told that its purpose was not speed shooting but rather, defeating a gun grab. Fitz's demonstration, which Keith participated in once, was to let an 'opponent' jab an unaltered gun into his big belly; Fitz would force the gun into his own belly while twisting the revolver against himself and actually would break the man's finger!
It was Askins' articles that inspired a very young Geoffrey Boothroyd to not only alter his own 1941 Smith & Wesson in .38 Short (all he could get in 1950s England) but also to recommend Fitzing to Ian Fleming for the James Bond character. Boothroyd's revolver was used to illustrate the cover of Fleming's next book wherein he set up the disaster that caused 'M' to issue the Berns-Martin holster and a Smith Bodyguard -- and the Walther PPK so that Bond could also have a silenced pistol -- in the book "Dr. No":