Dear SIGSHR, 9mms from Italian supplies might have been also 9mm M38, a special (and hotter) reoload for use in the MAB submachinegun.
BTW never fire anything than a 9mm Glisenti in a Glisenti: it would blow up that nice pistol in few rounds.
9mm parabellum, 9mmM38 and 9mmGlisenti are all the same size while the "load" is much different.
"L'arma più pericolosa sono gli uomini di piccolo calibro"
"Most dangerous gun is a small caliber man"