http://www.ebay.com/itm/Remington-SP-10-smooth-bore-22-buck-turkey-barrel-rem-choke-10ga-magnum-3-1-2-/161647000416?pt=LH_DefaultDomain_0&hash=item25a2e97b60
Heres a link to a 22" bbl for a SP-10. I know parts are hard to find for this gun. Hopefully this helps someone out.