This is utterly incorrect. The safety goes forward and you can shoot twice by pulling the same trigger. The safety goes rearward and nothing can shoot. The safety can be set to the left channel or the right channel and when pressed forward, will fire the corresponding barrel first. If you have the safety in the left channel, when you press it forwards it will fire the left barrel first, then the right barrel, with two pulls of the trigger. You do not need to touch the safety/selector between shots. That would be utterly pointless on this gun.
This is accurate. As JP said, you can call it a "semi-auto" for two shots.
The shotguns are 305mm by plunge measure. As always, check your local regulations and use best judgment when determining a use for your firearms.
The barrels pattern with FliteControl 00BUCK at around 7-8" at 7Y. With slugs we can hit an 8" steel plate at 60y with some good old Kentucky windage and some practice.
Barrels are cylinder bore.
And to clarify for several comments in here: These are not "cut down" or "sawn off" and are well within the law -- manufacturers can manufacture barrels at any length legally valid under the law, and here we have a legally valid (with FRT and everything, crazy I know!!) 12" manufactured barrel. Go hog wild.
Cheers,
Daniel