The Italians require 9 x 21mm cartridges. Regular 9mm Luger is 9x19mm.
It's known as
"9mm IMI" or "9mm Italian", and loaded to the standard 9mm Luger level, but develops less power because of the larger case volume, making it acceptable as a non-military caliber there.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.