not only shotguns
The example was a popular pump shotgun. The thing that was going to
be banned under the new law was the magazine tube cap. That
which holds the barrel tight to the action CAN be removed and an extension tube be added to increase the magazine capacity. Ie easily modified.
That means all of those pump and or semi auto shotguns like benelli, browning, remington, winchester, beretta and a whole host of others will also be banned. I even have a magazine tube extension for my Benelli M2. (Works great when a whole flock of crows come in and commit suicide, plus the extra weight really helps keep the swing going).
I think the shotgun and the DP are a statement about how the mayor of New York has banned items as protected as a shotgun and as evil as a 2 liter cola product.