It depends on the state. Florida is generaly decent on such things but I am not certain.
In MA for example a factory stock Remington Police or Marine magnum would be a high capacity firearm as they hold over 5 rounds, and not legal with just thier normal permission slip, erm license or FID. Even being pump action.
New Jersey has similar such legislation, but I think it is any shotgun with greater than 6 rounds, and there is no secondary license (?)
Basicly the only places with serious laws on pump guns seem to be the liberal strongholds. Of course NYC and Chicago would be in there, but they still have to overide and fight the rest of thier states that like freedom.
However I am not aware of most locations in the US restricting the capacity on pump shotguns for defensive purposes. The restrictions usualy pertain to hunting, or possession in and around such activities.
As mentioned there is a federal law limiting shotguns to three rounds for migratory birds, and many states have some limitation or another on round count for hunting.
You always need to do your research however. At any time some place can add a new definition of an "assault weapon" that can include some minor thing like having a pistol grip on a shotgun, without specifying pump or semi auto and the simple addition of the Knoxx could make it a crime.
can a Knox be fitted to a Benelli supernova
Probably under Florida law, but do your research, most state laws are online.
In CA it would become an evil assault weapon with the addition of the Knoxx, become a felony, and subject someone to prison time. Same exact gun, same action, but a different grip on a semi auto shotgun.
It would give it a "folding or telescoping stock" and a "pistol grip protruding conspicuously beneath the action of the weapon, a thumbhole stock, or a vertical handgrip." Thus making it an assault weapon by features.
Florida gun laws appear to be pretty simple though:
http://www.nraila.org/statelawpdfs/FLSL.pdf is a brief summary.
You can't even find the term assault weapon on there. Most of the laws seem to be about enhancements for having a firearm or certain type of firearm during a crime, how they can be stored or carried, and who is allowed to have them and where.
The only thing I saw that looked close to "assault weapon" type legislation was the additional offense of having a firearm that holds over 20 centerfire rounds in a crime.
You can look up NC just as easily.
I think that is just a CYA move. Notice they list pump actions, and not semi autos. An 870 can use the same stock as an 1100 or 11-87, but they mention the 870 and not either of the semi autos.
Considering the installation of that stock on a semi auto shotgun is a felony offense in the state which knoxx was based in when they wrote most of thier information (Paso Robles, California), and various legislation on semi autos is more complex in parts of the country, I think they would just rather sell them advertised for pump actions.
They however were recently purchased by BlackHawk products, based out of Virginia, and are being relocated to Idaho.
But there website is written in California legal terms.
So these stocks will in fact work with models not listed on thier site, and there is many adapters on the net to use common model accessories with less common models, and that could easily include using an attachment for a supported model on the Benelli.
