I’ve never understood banning sawed off shot guns. Musta been the “assault rifle” of that era.
It was the sensationalist reporting of the newspapers of the time, somewhat like the switchblade ban from the 50’s.
Sawed off shotguns were a substitute for handguns. There were handgun “controls” in a number of States, mainly California and the Northeast, just where we see the most restrictions today.
My theory is that the moonshiners and bootleggers liked to use them and they were a feared weapon by the revenuers.
Concealable.