Re: Stevens auto shot .410 pistol
Bill was on to something.
Also from Chapter 2:
A shot pistol (“any other weapon”) such as an H&R Handy Gun may be removed from the NFA by
either disposing of the smooth bore barrel or permanently installing a rifled sleeve chambered to accept
a standard pistol cartridge into the smooth bore barrel. Modified by sleeving the barrel, an H&R Handy
Gun is no longer an NFA weapon because it now has a rifled bore.
The only other reasonable way to have a legal gun would be to permanently add a barrel extension that meets minimum length requirements and brings the gun to overall minimum length requirements.
If at first you don't succeed, shoot, shoot again.