They’re not firearms at all and you could get the same effect using rubber bands. Also? If you REALLY wanted one you’ve had more than a year to buy one.
“Haven’t even seen any shoelaces, super glue, or paper clips for sale here.”
“Unintended Consequences,” by John Ross
.
Most of the bumpstock afficionados jacked up the body of their Ford Granadas for big rubber cuz they don’t own a PU.
.