Not sure if this is a viable option, but current BACO bottom metal has a one-piece trigger guard, made of aluminum, and has a steel floor plate. Don't know if "Winchester" / Browning / FN will sell just the bottom metal. It is not all aluminum nor steel, but a combination. Perhaps it is light enough. Maybe someone is selling their BACO Win 70 bottom metal after replacing it with something else. Ebay?
Just a thought. Free advice is worth what you pay for it.
