This has been discussed in another thread.
There is at least speculation, if not fact, that the ATF would consider the programming of the CNC machine to be part of the work.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.