At one point my Remington 1100 12 GA shotgun was on the banned "assault weapon" list as it is semi automatic, forget the facts that it can hold a maximum of 5 (yes, grand total five) shells, and that is only if you remove a factory installed spacer in the magazine.
An anti gun activist once asked me "What the hell do you need an assault weapon like that for?"
Well let's see, I was competing in both trap and skeet at the time, expending anywhere from 200 to 250 rounds a day, many as part of "doubles" where two clay birds are thrown at the same time.
Had I attempted to practice that much using a double barrel, my shoulder would have been permanently purple. The semi auto action reduces the recoil considerably.
What made my 12 GA any worse than a double barrel? The fact that it "reloads itself".