It is possible that it will make it across. So many packages, so few customs agents.
I have had no problem shipping a couple of clear body guns (customs told me they were ok). I have then purchased the metal body parts seperatly with no issues either.
Customs is hit and miss. 2 guys I work with had bottles of wine shipped to them as gifts last week. One got the wine, the other got an empty box with a letter in it saying it was confiscated.
I am somebody elses imaginary friend.