I haven't recently asked any mobsters to show me what they were carrying. But, from what I've seen and read about, looks like 9mm wins. A compact or subcompact 9mm can be pretty small but can pack a lot of rounds in the magazine. Round is more lethal than a .380. .22 is still a good close-up assassination weapon.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.