That's right- they don't 'take down' in the conventional sense. Their barrels are fixed by being threaded more or less permanently into the receiver. A gunsmith could remove/replace the barrel, but not most owners.
They're great pumpguns, regardless of this drawback. A bit of trivia- it cost the parent company (High Standard) a contract with the Air Force, once upon a time. It came down to a nose-to-nose decision between the Flite King riot gun and the 870, and the Flite King lost out because the barrel couldn't be removed by the user.
lpl