The best advise I can give you is to contact your nearest FFL dealer and ask them to help. The regulations permit all 01 FFLs to occasionally import a non-military type firearm and your shotgun should meet this criteria. The form that needs to be completed is a Form 6. There is information of course that the Italian company will have to provide as well.I haven't done this in quite awhile and I suspect I'm leaving some things out but others should be along to provide additional information.
Jim

The 2nd Amendment IS an unalienable right.