I realize some are frantic to ignore facts and sling empty rhetoric around. The government is run by many 'unelected' bureaucrats. Like most positions that head major branches, Senate confirmation is part of the process. (Course many Presidents to include tRump use 'acting' heads if the Senate baulks at the choice.)
Got to love the Rabid Right's use of unelected as if there is something commie or un-American. A legal/governmental scholar such as yourself knows very well hundreds of positions are filled 'unelected' to include supreme courts Justices. Hucklebee's wailing about unelected bureaucrats is a classic Rabid Right Rant.
Seems to me the precedent was set back in the 30's when machine guns were declared contraband (to use your view of the word). I'm not sure when these triggers became available, but it seems like they are pretty new. Manys the time a new product comes on the market only to be banned, or highly regulated. I'd opine if you try to skirt the spirit, letter of the law don't be surprised when your bubble gets a pin in it...