I hope not, I mean it's not a complicated mechanism, I have a small but thorough machine shop in my basement, just because I could manufacture many things that would be highly illegal does not mean that's what I am, or intend to be doing.
Don't worry. The key wording in the law is "readily convertible to fire fully automatic" Having to mill your own parts is not "readily convertible" even by ATF standards.
Now a 3D printer makes things much easier but for now comments like Skans' are nothing but jokes and snide remarks. In the future however, who knows.