Re: Legal Question: Is this the way to challenge the NFA?
What you've got is a history question, CJ.....
By the time Miller vs US came to SCOTUS the principal appellate, (Miller) was dead. The government was allowed to admit unchallegened "evidence" a sawed-off shotgun was not part of the Army's issue weapons. This was contrary to fact circa WW 1. IOW the resultant SCOTUS decison was flawed in concept and substance.
IMO, little of Miller vs US is germane to our present situation. Far too much anti-gun legislation and regulation has passed under the bridge. >MW