FWIW I had no problems importing it to Germany.
HCG includes a letter (in English) describing it as harmless toy. HCG send it with UPS so they (UPS) will do the customs stuff for you.
Plus the (plastic) barrel is closed.
So it is fairly obvious that tis is not a real gun.
Good luck.
Same here for Spain and I think regulation here is really close to the one in Italy.
No issues at all and as Faust1103 says, the package includes clear documentation this is a toy replica.
Cheers.