Well, a S&W revolver COULD have a Muribito safety (probably not back then though). And there really exists a Glock 17 with a separate safety (shown at a 2009 firearms expo) though the rumors of the Tasmanian police using it are denied.
This is the problem with niche expert readers. I'd e-mailed Robert Ludlum before over rare errors in his books, both weapons and cars.
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