Having a Glock and this "kit" would be called "Constructive Possession". Just a guilty as having it assembled.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
Who ever and what ever gets ruled upon, make sure you get it in writing. Word of mouth isn't going to help you in court! Also, BATF is know to "OK" something and then later come back and over rule the first ruling....
Seems like to much trouble for a toy that rarely will be used, I think I'll pass but for sure will ask the BTAF some day to clear my doubts