Yes, for shooting the plastic sabots that contain a slug smaller than 12 gauge. I prefer rifled slugs that have grooves on the slug and should be fired in a smooth bore improved cylinder. I have a 20” Remington barrel for my 870 that is smooth bore with rifle sights and uses screw in chokes, the improved cylinder for rifled slugs, a full choke for turkey hunting and a rifled choke if I wanted to use sabots. The Improved cylinder is also best for 00 buck.
I’ve only ever used rifled slugs. The idea of a rifled shotgun barrel is strange to me. Would it not be, at that point, a rifle? That’s the very nature of the word: rifle/rifling. Would 00 or any pelletized shell gain an advantage through the rifling, or is it intended to be used solely with sabot rounds?
Learn something new everyday.