Re: Black powder rifle kits
The originals generally had blued barrels and lockplates, with brass trigger guards, patch box covers and sideplates, and lock sideplates (on the other side of the stock). In some fancier guns, those parts were silver plated or of German silver.
The stocks were usually maple and the screws were iron, not brass. (As one old time rifle maker asked me when I asked why iron and not brass, "Did you ever try to drive a brass screw into rock maple?")
Some barrels were colored brown or plum.