I would suggest that a longarm with its stock sawed off or replaced with something that doesn't have a butt would not be a handgun.
If this were the case, all the uberkewl pistol gripped shotguns would be restricted firearms, regardless of barrel length.
Incidentally, a verifier cannot contribute much to the classification of a firearm - all a verifier can do is try to match a firearm with an existing FRT entry.
Hmmmm... I think the reason the pistol gripped shotguns are not handguns is that they have a forestock as well and are therefore designed to be fired by the action of 2 hands. Any stock you designed for this would have to be quite explicit in being designed for one handed use.
There is one possible exception.....
We have seen that if a brand new, never assembled as a firearm, VZ58 machinegun receiver is remanufactured into a semi auto, the resulting firearm is either restricted or non-restricted, depending on barrel length. This being the case, if a brand new, never assembled as a firearm receiver, for an antique rifle, were located, presumably it could be assembled into some sort of handgunnish repeating firearm, and not lose antique status. Of course, it would be necessary to be able to prove that the receiver had never been assembled as a firearm.
I think that this would also work, and much more easily than any conversion, if you could find and document such a receiver.
Just as a note to all players:
I'm not a lawyer, I'm not advocating trying to make a handgun out of a "would be antique but it's a repeater" rifle. I firmly believe that you would NEVER be able to get one deregistered without a LOT of court time, and that would be very expensive. I'm just having fun playing with the idea. I find edge cases and unintended consequences interesting.
Respectfully , I've never liked that definition - for example, just how many RCMP/CFC "techs" could fire a .500 S&W revolver with one hand ?
So maybe all such revolvers are really "non-semi-automatic" short-barrel rifles with pistol grips ?
I think, the way that things are currently done, and the way the law is currently written, you could at least have a solid argument that something like a contender that shipped from the factory with a 28" barrel (and foregrip, but that's default), or possibly a
600 NE revolver is actually a long gun. Once again though, making that stick would require significant court time and money.
Soapbox time!
I think that the reason such edge cases appear so often in firearms law is that they're trying to force artificial distinctions on guns. For instance, if I have an 870 and put a rifled barrel on it, is it a shotgun or a rifle? Now how about if I take a "Zulu" shotgun and put a 12ga rifled barrel on it? For the 870 it doesn't matter much, but it sure does for the zulu. If a zulu with a 12ga rifled barrel is a shotgun, it's not an antique, but if it's a rifle it is!
Once again, just playing around with the edge cases of the law in my mind. If anyone is over-equipped with time and money, please feel free to use any of my ideas you'd like to try and make a case out of this. I can pretty much guarantee after the attempt you won't be over-equipped with either.
J