I'm considering buying a traditional double-barrel shotgun, one that breaks down for loading and ejecting, and then cutting down the barrel to somewhere around 12 => 14 inches, and also modifying the stock - making it shorter, too, so the stock would end up being similar to a pistol grip. As far as the ATF is concerned, this would be classified as a Short Barrel Shotgun, correct? The correct form to fill out and submit before modifying the gun is ATF Form 1 (5320.1), correct? Once I get the approved form back from ATF, I can modify the gun, or have it modified by the appropriately licenses gunsmith, correct? Anything I'm missing here? Thanks!