870 Wingmaster Butt Stock and barrel

Looking for a butt stock for a nice Remington 870 Wingmaster from a 1960s to late 1970s large frame shotgun, including 12 GA or large frame 20 GA. Lightweight shotguns, such as those that are currently made will not work. Also looking for a nice 28" modified 20 GA large ring barrel with vented rib that will accept 3 inch shells. Large ring barrels come from 20 GA that were built on 12 GA frames and are categorized as large frame 20 GA. A quarter can pass through the retaining ring on large frame barrels. Let me know what you got.