The way I look at it is this.
If Benelli can’t or won’t import the part, dealers and distributors can’t get the part imported, I sure as **** wouldn’t stuff one in a suitcase. There may be a bit of a gray area with a firearm part as opposed to an entire firearm. However, I default to the above.
Take importation of parts from Canada as an example. There is a restriction upon what can be imported and the value is limited to $100 for one part and a limit of a total value of $500 for a single transaction.
Last I knew bringing any part into the US from Europe required an APPROVED form 6 importation permit to be presented to customs upon arrival.