My 20ga Mossy came with a full length/modified choke/plain barrel & a mail-in coupon for choice of several extra barrels. The full choke/vent rib that I chose served every purpose so well, that I shortened the plain barrel to HD length (18.5"). A couple years ago I picked up an 24" rifled slug barrel (Slugster) with rifle sights installed on clearance from Midway for about 60 bucks