If it was considered a handgun it would be a smooth bore handgun. That would make it an AOW. But it is t a handgun do it isn't an AOW.
OK, now I understand what you were saying.
If I'm not mistaken, the ATF has decided that a pistol gripped shotgun isn't classified as a handgun or a shotgun but fits into the "other" category, is that the way you understand it??