Originally Posted by house
Company's that make the lowers can't finish them. But you your self can or go to another place to get it done.
No, you can't "get it done." In order for the gun to have been made by yourself, you must do all the work personally. If you take it to someone to get it done, whoever does that must have a manufacturer's license and must transfer the finished product on a 4473 with all required formalities.
Note from the thread I linked to above that ATF appears to be taking an extreme position. So it appears that anyone who provides CNC machines and machine set up is at risk, even if the owner of the 80% piece is pushing the buttons.