What if the barrel is rifled on HR handy gun?

If the Barrel is rifled I would say that satisfies the BATF ruling and makes the gun equal to any other Pistol that has a rifled barrel. The whole ruling on this particular firearm is so ridiculous that it makes anyone that was involved in writing this law and singling out firearms like this a complete idiot doesn't make any sense. Rifling only makes the projectile spin as it goes through the air much like a well passed Football and increases accuracy. Having said that, find yourself a good Gunsmith and have the barrel riffled.