I just received a Remington Wingmaster 870 Magnum today, bought it from a fellow member, and it came with a 28" and a 21" barrel. Both barrels have the Remington chokes and the stocks are the standard sizes, not youth stocks. I was wondering what purposes the 21" barrel could be used for. It's smooth bore, VR, and bead sights. What uses could it be intended for?