[cakes]

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.
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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.