The early Knight Disc .45s had faster 1:20" twist rifling and make great heavy conical shooters (anything prior to #2291 on blued steel and #5043 on stainless were 1:20 twist) Later guns were 1:30" twist and more suited to sabots. The 1:20" twist .45 Knights are highly sought after. However, all that being said, I don't think the original Disc rifles, as opposed to the Disc Extremes, came with laminated stocks (could be wrong here but never seen one). If it's a Disc or Disc extreme, it can be converted to shoot bare 209s for BH209.
