People make up their own problems.
Question: "What's in the box"
Three choices are below. Pick the "path of least hassle" one and let's see how we do:
Choice A: "machine parts"
Choice B: "None of your business"
Chpice C: "Well, it's a gun, but according to the GCA of 1968 it's not a firearm, <insert long and confusing explaination here>.
Ta-Da... It's a self imposed penalty on dumb to anyone not picking the correct answer.