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The configuration that the Shockwave comes in from the factory classifies it as a "firearm" and not a shotgun by the ATF which allows it to be sold without a $200 tax stamp being required. Taking a normal shotgun and cutting the barrel down to this length would make a "short barrel shotgun" which is regulated under the National Firearms Act and requires a bunch of paperwork and long wait times along with the aforementioned $200. None of that applies to the Shockwave unless you were to remove the grip and fit a traditional stock.

it does not require a NFA (national firearm act) tax stamp (license ) because it is not a sawed off shotgun it is classified as a "firearm" because it holds a unique place in the rules no it is not classified as a pistol it is just classified as a firearm "the Shockwave is classified by the ATF as a “firearm” and available to shooters without having to buy a tax stamp or fill out paperwork" range365.com/mossberg-shockwave-gun-test#page-5

Joe, Means you do not have to register it as NFA item with the government to own it. No form 1. No waiting on paperwork to come back.