You really turned your black walnut pistol stock into an English walnut stock. Well done. Below are photos of an English walnut stock so you can see how close you came.
I think the biggest problem folks have staining ANY type of gun stock wood is they don't understand you have to do something to ensure you don't get blotchy spots in some areas. Those areas are the end grain of the wood.after reading through the previous past threads and posts i need to go and reset my brain. so many ideas.