I can't seem to find replacement friction pieces for my Browning Auto-5 Magnum Twelve, 12ga. Midway USA, Brownells and Midwest Gun Works used to carry the bronze friction pieces and rings for the Magnum. Now it seems all of them are "out of stock" and no backorder. I also checked Gunbroker and Ebay. No friction rings for the magnum guns. Does anyone know where to find them? Has the world's friction ring supply completely dried up?