Yes, see the FAQs retail parts page, all available stocks and forends are listed there, you can post an ad in the H&R Want to Buy forum to buy a used set as well, all H&R stocks fit all of their single shot firearms, forends too except for some shotgun forends. There are no forends specifically for bull barrels, forend channels are all the same.
Just a note for those that forgot, buying/selling/trading is not allowed in discussion forums.
Tim
http://www.gboreloaded.com/forums/index.php#c12