I was specifically referring to pistol grip only shotgun shell firing firearms with barrel lengths of less than 18 inches (subject to certain other parameters). I am not convinced that a particular weapon being currently readily available eliminates the risk of prosecution. I see a lot of bats with nails and barbed wire currently being sold at gun shows. I am not convinced that there is no risk of prosecution for possession of a Prohibited Offensive Weapon as an add on charge if one is used in self defense.
Likewise, I was interested in keeping a firearm like the Mossberg Shockwave for self defense. After reading and participating in this thread, I am now hesitant to keep a Mossberg Shockwave for self defense because I would rather there be no serious question as to the current legality of a defensive firearm under state law. I do not want the possibility of a lifetime firearm ban under federal law add-on charge in an otherwise justified self defense case.