Great idea to have 2 forends, Chuck, as I can't imagine the Galazan .410 bbls fitting the original forend as well as the original 28 ga bbls do. That said, good luck ever finding Parker Repro forend metal. I don't believe I've ever seen one for sale. By the way, be sure to join or at least lurk here: http://parkerguns.org/forums/
Enjoy your new Repro; they are great guns!
Joe