First off, would you who know, buy something like this off of ebay....????.....and Second, why would Ithaca make a replacement barrel for a 1100 Mod Remington???
http://cgi.ebay.com/ITHACA-RIFLED-SHOTGUN-BARREL-FOR-REMINGTON-1100_W0QQitemZ7226904039QQcategoryZ73955QQrdZ1QQcmdZViewItem#ebayphotohosting
http://cgi.ebay.com/ITHACA-RIFLED-SHOTGUN-BARREL-FOR-REMINGTON-1100_W0QQitemZ7226904039QQcategoryZ73955QQrdZ1QQcmdZViewItem#ebayphotohosting