Cooper made that recommendation over 40 years ago, regulations might have been different then.
But my main aim was to cite a big bore traditionalist who could find a use for the needle blower.
Even though Mr Harrell thinks the 1911 is a blowback action and I don't, he does point out something I have seen elsewhere, the guns don't work.
That Glock conversion with the TCM short functioned reliably while I was watching and shooting.